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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2013	Apr. 26, 2013
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Trading Symbol	MRC
Entity Registrant Name	MRC GLOBAL INC.
Entity Central Index Key	0001439095
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		101,687,820

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash	$ 27,421	$ 37,090
Accounts receivable, net	806,723	823,236
Inventories, net	955,468	970,228
Deferred income taxes	5,261	6,603
Other current assets	19,916	13,417
Total current assets	1,814,789	1,850,574
Other assets	35,948	37,031
Property, plant and equipment, net	120,964	122,458
Intangible assets:
Goodwill, net	610,222	610,392
Other intangible assets, net	735,672	749,272
Total intangible assets	1,345,894	1,359,664
Total assets	3,317,595	3,369,727
Current liabilities:
Trade accounts payable	519,218	438,344
Accrued expenses and other current liabilities	105,856	124,026
Income taxes payable	24,912
Deferred revenue	5,320	1,573
Deferred income taxes	80,160	79,661
Current portion of long term debt	6,500	6,500
Total current liabilities	741,966	650,104
Long-term obligations:
Long-term debt, net	1,066,570	1,250,089
Deferred income taxes	255,993	261,448
Other liabilities	22,197	22,164
Total noncurrent liabilities	1,344,760	1,533,701
Commitments and contingencies
Stockholders' equity:
Common stock, $0.01 par value per share; 500,000 shares authorized, 101,685 and 101,563 issued and outstanding, respectively	1,017	1,016
Preferred stock, $0.01 par value per share; 100,000 shares authorized, no shares issued and outstanding
Additional paid-in capital	1,629,729	1,625,900
Retained (deficit)	(372,647)	(418,830)
Accumulated other comprehensive loss	(27,230)	(22,164)
Total stockholders' equity	1,230,869	1,185,922
Total liabilities and stockholders' equity	$ 3,317,595	$ 3,369,727

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares shares in Thousands	Mar. 31, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000	500,000
Common stock, shares issued	101,685	101,563
Common stock, shares outstanding	101,685	101,563
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000	100,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
Sales	$ 1,305,100	$ 1,382,632
Cost of sales	1,058,529	1,146,071
Gross profit	246,571	236,561
Selling, general and administrative expenses	160,757	146,384
Operating income	85,814	90,177
Other income (expense):
Interest expense	(15,302)	(33,717)
Write off of debt issuance costs		(1,685)
Change in fair value of derivative instruments	567	2,125
Other, net	116	1,747
Income before income taxes	71,195	58,647
Income tax expense	25,012	21,113
Net income	$ 46,183	$ 37,534
Basic earnings per common share	$ 0.45	$ 0.44
Diluted earnings per common share	$ 0.45	$ 0.44
Weighted-average common shares, basic	101,609	84,437
Weighted-average common shares, diluted	102,426	84,756

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 46,183	$ 37,534
Other comprehensive (loss) income before tax-Foreign currency translation adjustments	(5,473)	5,421
Income tax benefit (expense) related to components of other comprehensive income	407	(637)
Total other comprehensive (loss) income, net of tax	(5,066)	4,784
Comprehensive income	$ 41,117	$ 42,318

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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+ Details

- Definition

Before tax and net of reclassification adjustments of the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity. Also includes the following: gain (loss) on foreign currency forward exchange contracts; foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; and gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) that has been designated and qualified as a hedging instrument for hedging of the foreign currency exposure of a net investment in a foreign operation.

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- Definition

Tax effect of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest.

+ References

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+ Details

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities
Net income	$ 46,183	$ 37,534
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	5,392	4,131
Amortization of intangibles	13,243	12,317
Equity-based compensation expense	1,920	1,841
Deferred income tax benefit	(4,017)	(2,110)
Amortization of debt issuance costs	1,446	2,326
Write off of debt issuance costs		1,685
(Decrease) increase in LIFO reserve	(3,072)	6,900
Change in fair value of derivative instruments	(567)	(2,125)
Provision for uncollectible accounts	(907)	727
Non-operating losses and other items not using cash	388	700
Changes in operating assets and liabilities:
Accounts receivable	11,937	(44,150)
Inventories	12,581	(68,807)
Income taxes payable	25,198	14,044
Other current assets	(6,987)	(5,834)
Accounts payable	83,484	43,816
Deferred revenue	3,763	(2,026)
Accrued expenses and other current liabilities	(15,578)	17,346
Net cash provided by operations	174,407	18,315
Investing activities
Purchases of property, plant and equipment	(4,890)	(4,458)
Proceeds from the disposition of property, plant and equipment	52	1,195
Acquisitions, net of cash acquired		(72,816)
Other investment and notes receivable transactions	295	(3,813)
Net cash used in investing activities	(4,543)	(79,892)
Financing activities
Payments on revolving credit facilities	(544,460)	(537,064)
Proceeds from revolving credit facilities	365,167	651,210
Payments on long term obligations	(1,625)	(31,456)
Debt issuance costs paid	(173)	(7,099)
Proceeds from exercise of stock options	1,459
Tax benefit on stock options	451
Net cash (used in) provided by financing activities	(179,181)	75,591
Increase (decrease) in cash	(9,317)	14,014
Effect of foreign exchange rate on cash	(352)	(1,308)
Cash - beginning of period	37,090	46,127
Cash - end of period	27,421	58,833
Supplemental disclosures of cash flow information:
Cash paid for interest	13,648	7,444
Cash paid for income taxes	$ 3,219	$ 9,982

Background and Basis of Presentation	3 Months Ended
Background and Basis of Presentation	Mar. 31, 2013
Accounting Policies [Abstract]
Background and Basis of Presentation	NOTE 1 – BACKGROUND AND BASIS OF PRESENTATION Business Operations: MRC Global Inc. is a holding company headquartered in Houston, Texas. Our wholly owned subsidiaries, McJunkin Red Man Corporation and its subsidiaries, are global distributors of pipe, valves, fittings (“PVF”) and related products and services across each of the upstream (exploration, production and extraction of underground oil and gas), midstream (gathering and transmission of oil and gas, gas utilities and the storage and distribution of oil and gas) and downstream (crude oil refining, petrochemical processing and general industrials) sectors. We have branches in principal industrial, hydrocarbon producing and refining areas throughout the United States, Canada, Europe, Asia and Australasia. Our products are obtained from a broad range of suppliers. Basis of Presentation: We have prepared our unaudited condensed consolidated financial statements in accordance with Rule 10-01 of Regulation S-X for interim financial statements. These statements do not include all information and footnotes that generally accepted accounting principles require for complete annual financial statements. However, the information in these statements reflects all normal recurring adjustments which are, in our opinion, necessary for a fair presentation of the results for the interim periods. The results of operations for the three months ended March 31, 2013 are not necessarily indicative of the results that will be realized for the fiscal year ending December 31, 2013. We have derived our condensed consolidated balance sheet as of December 31, 2012 from the audited financial statements for the year ended December 31, 2012. You should read these condensed consolidated financial statements in conjunction with the consolidated financial statements and notes thereto for the year ended December 31, 2012. The consolidated financial statements include the accounts of MRC Global Inc. and its wholly owned and majority owned subsidiaries (collectively referred to as the “Company” or by such terms as “we,” “our” or “us”). All material intercompany balances and transactions have been eliminated in consolidation. Recently Issued Accounting Standards: In February 2013, the Financial Accounting Standards Board (“FASB”) issued Standards Update No. 2013-05, Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity (ASU 2013-05), which specifies that a cumulative translation adjustment (“CTA”) should be released into earnings when an entity ceases to have a controlling financial interest in a subsidiary or group of assets within a consolidated foreign entity and the sale or transfer results in the complete or substantially complete liquidation of the foreign entity. For sales of an equity method investment that is a foreign entity, a pro rata portion of CTA attributable to the investment would be recognized in earnings upon sale of the investment. When an entity sells either a part or all of its investment in a consolidated foreign entity, CTA would be recognized in earnings only if the sale results in the parent no longer having a controlling financial interest in the foreign entity. CTA would be recognized in earnings in a business combination achieved in stages. ASU 2013-05 is effective for us prospectively in 2014. We do not expect this update to have a material impact on our financial statements.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

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+ Details

Inventories

3 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

Inventories

NOTE 2 – INVENTORIES

The composition of our inventory is as follows (in thousands):


	March 31,			December 31,
	2013			2012
Finished goods inventory at average cost:
Energy carbon steel tubular products	$	382,066		$	387,609
Valves, fittings, flanges and all other products		740,930			752,630

		1,122,996			1,140,239
Less: Excess of average cost over LIFO cost (LIFO reserve)		(147,910	)		(150,982	)
Less: Other inventory reserves		(19,618	)		(19,029	)

	$	955,468		$	970,228

Long-Term Debt

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Long-Term Debt

NOTE 3 – LONG-TERM DEBT

The components of our long-term debt are as follows (in thousands):


	March 31,		December 31,
	2013		2012
Senior secured term loan B, net of discount of $6,113 and $6,345	$	640,637	$	642,030
Global ABL Facility		425,980		608,006
Other		6,453		6,553

		1,073,070		1,256,589
Less current portion		6,500		6,500

	$	1,066,570	$	1,250,089

Senior Secured Term Loan B: We have a $650 million seven-year Term Loan B (the “Term Loan”) which amortizes in equal quarterly installments of 1% per year with the balance payable in November 2019 when the facility matures. The Term Loan allows for incremental increases up to an aggregate of $200 million, plus an additional amount such that the Company’s senior secured leverage ratio (as defined under the Term Loan) would not exceed 3.50 to 1.00. This facility is guaranteed by us as well as all of our wholly owned U.S. subsidiaries. In addition, it is secured by a second lien on those assets securing our Global ABL Facility (which includes accounts receivable, inventory and related assets) and a first lien on substantially all of our other assets and those of our U.S. subsidiaries, as well as a pledge of all of the capital stock of our domestic subsidiaries and 65% of the capital stock of first tier, non-U.S. subsidiaries. The Term Loan has mandatory prepayment requirements ranging from 0% to 50% of excess cash flow, beginning for the year ended December 31, 2013 and depending on our senior secured leverage ratio, and contains a number of customary restrictive covenants.

The interest rate for the Term Loan was 6.39% as of March 31, 2013 and December 31, 2012.

Global ABL Facility: We have a $1.25 billion multi-currency global asset-based revolving credit facility (the “Global ABL Facility”) that matures in March 2017. This facility is comprised of $977 million in revolver commitments in the United States, $170 million in Canada, $12 million in the United Kingdom, $75 million in Australia, $9 million in the Netherlands and $7 million in Belgium. It contains an accordion feature that allows us to increase the principal amount of the facility by up to $300 million.

We and each of our current and future wholly owned material U.S. subsidiaries guarantee the obligations of our borrower subsidiaries under the Global ABL Facility. Additionally, each of our non-U.S. borrower subsidiaries guarantees the obligations of our other non-U.S. borrower subsidiaries under the Global ABL Facility. Outstanding obligations are generally secured by a first priority security interest in accounts receivable, inventory and related assets.

The interest rate for the Global ABL Facility was 1.91% and 2.21% as of March 31, 2013 and December 31, 2012, respectively.

Availability under our Global ABL Facility was $560 million as of March 31, 2013.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Stockholders' Equity

3 Months Ended

Mar. 31, 2013

Equity [Abstract]

Stockholders' Equity

NOTE 4 – STOCKHOLDERS’ EQUITY

Stock Options and Restricted Stock

Our 2011 Omnibus Incentive Plan has 3,250,000 shares reserved for issuance pursuant to the plan. The plan permits the issuance of stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance units and other stock-based and cash-based awards. Since the adoption of the 2011 Omnibus Incentive Plan, the Company’s Board of Directors has periodically granted stock options and restricted stock to directors and employees, but no other types of awards have been granted under the plan. Options and stock appreciation rights may not be granted at prices less than their fair market value on the date of the grant, nor for a term exceeding ten years. For employees, vesting generally occurs over a four or five year period on the anniversaries of the date specified in the employees’ respective agreements, subject to accelerated vesting under certain circumstances set forth in the option agreements. Vesting for directors generally occurs in one year. In March 2013, 641,294 stock options and 87,914 shares of restricted stock were issued to employees. To date, 1,793,969 shares have been granted to management, members of our Board of Directors and key employees under this plan. We expense the fair value of the stock option grants on a straight-line basis over the vesting period. A Black-Scholes option-pricing model is used to estimate the fair value of the stock options.

Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss in the accompanying consolidated balance sheets consists of the following (in thousands):


	March 31,			December 31,
	2013			2012
Currency translation adjustments	$	(26,895	)	$	(21,829	)
Pension related adjustments		(335	)		(335	)

Accumulated other comprehensive loss	$	(27,230	)	$	(22,164	)

Earnings per Share

Earnings per share are calculated in the table below (in thousands, except per share amounts).


	Three Months Ended
	March 31,		March 31,
	2013		2012
Net income	$	46,183	$	37,534

Average basic shares outstanding		101,609		84,437
Effect of dilutive securities		817		319

Average diluted shares outstanding		102,426		84,756

Net income per share:
Basic	$	0.45	$	0.44
Diluted	$	0.45	$	0.44

Stock options and shares of restricted stock are disregarded in this calculation if they are determined to be anti-dilutive. For the three months ended March 31, 2013 and 2012, our anti-dilutive stock options approximated 0.6 million and 2.3 million.

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

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Reference 20: http://www.xbrl.org/2003/role/presentationRef
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-Number 210
-Section 08
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+ Details

Segment Information

3 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Segment Information

NOTE 5 – SEGMENT INFORMATION

We operate as three business segments, U.S., Canada and International. Our International segment consists of our operations outside of the U.S. and Canada, principally Europe, Asia and Australasia. These segments represent our business of selling PVF and related products and services to the energy and industrial sectors, across each of the upstream (exploration, production and extraction of underground oil and gas), midstream (gathering and transmission of oil and gas, gas utilities, and the storage and distribution of oil and gas) and downstream (crude oil refining, petrochemical processing and general industrials) sectors.

The following table presents financial information for each segment (in millions):


	Three Months Ended
	March 31,			March 31,
	2013			2012
Sales
U.S.	$	965.6		$	1,052.7
Canada		204.5			208.2
International		135.0			121.7

Consolidated revenues	$	1,305.1		$	1,382.6

Operating income
U.S.	$	74.2		$	75.2
Canada		8.2			9.6
International		3.4			5.4

Total operating income		85.8			90.2
Interest expense		(15.3	)		(33.7	)
Other, net		0.7			2.1

Income before income taxes	$	71.2		$	58.6


	March 31,		December 31,
	2013		2012
Total assets
U.S.	$	2,688.7	$	2,732.4
Canada		223.3		249.1
International		405.6		388.2

Total assets	$	3,317.6	$	3,369.7

Our net sales by product line are as follows (in thousands):


	Three months ended
Type	March 31, 2013		March 31, 2012
Energy carbon steel tubular products:
Line pipe	$	261,625	$	290,353
Oil country tubular goods (OCTG)		126,115		221,221

	$	387,740	$	511,574

Valves, fittings, flanges and other products:
Valves and specialty products	$	362,718	$	331,832
Carbon steel fittings and flanges and stainless steel and alloy pipe and fittings		289,767		276,526
Other		264,875		262,700

	$	917,360	$	871,058

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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-Name Statement of Financial Accounting Standard (FAS)
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+ Details

Fair Value Measurements	3 Months Ended
Fair Value Measurements	Mar. 31, 2013
Fair Value Disclosures [Abstract]
Fair Value Measurements	NOTE 6 – FAIR VALUE MEASUREMENTS From time to time, we use derivative financial instruments to help manage our exposure to interest rate risk and fluctuations in foreign currencies. All of our derivative instruments are freestanding and, accordingly, changes in their fair market value are recorded in earnings. As of March 31, 2013, we do not have any interest rate swap agreements. Foreign exchange forward contracts are reported at fair value utilizing Level 2 inputs, as the fair value is based on broker quotes for the same or similar derivative instruments. The total notional amount of our forward foreign exchange contracts was approximately $58 million and $69 million at March 31, 2013 and December 31, 2012, respectively. We had approximately $570,000 and $3,000 recorded as assets on our consolidated balance sheets as of March 31, 2013 and December 31, 2012, respectively. With the exception of long-term debt, the fair values of our financial instruments, including cash and cash equivalents, accounts receivable, trade accounts payable and accrued liabilities approximate carrying value. The carrying value of our debt was $1.073 billion and $1.257 billion at March 31, 2013 and December 31, 2012, respectively. We estimate the fair value of the Term Loan using Level 2 inputs, or quoted market prices. The fair value of our debt was $1.080 billion and $1.261 billion at March 31, 2013 and December 31, 2012, respectively.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2013
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 7 – COMMITMENTS AND CONTINGENCIES *Litigation* Asbestos Claims. We are one of many defendants in lawsuits that plaintiffs have brought seeking damages for personal injuries that exposure to asbestos allegedly caused. Plaintiffs and their family members have brought these lawsuits against a large volume of defendant entities as a result of the defendants’ manufacture, distribution, supply or other involvement with asbestos, asbestos containing-products or equipment or activities that allegedly caused plaintiffs to be exposed to asbestos. These plaintiffs typically assert exposure to asbestos as a consequence of third-party manufactured products purportedly distributed by MRC. As of March 31, 2013, we are named a defendant in approximately 266 lawsuits involving approximately 903 claims. No asbestos lawsuit has resulted in a judgment against us to date, with a majority being settled, dismissed or otherwise resolved. Applicable third-party insurance has substantially covered these claims, and insurance should continue to cover a substantial majority of existing and anticipated future claims. Accordingly, we have recorded a liability for our estimate of the most likely settlement of asserted claims and a related receivable from insurers for our estimated recovery, to the extent we believe that the amounts of recovery are probable. While the outcome of legal proceedings is inherently uncertain, based upon our historical experience with these types of claims and analysis of pending claims, we do not believe that there is a reasonable possibility of potential losses arising from these claims that would have a material adverse impact on our consolidated financial statements. Other Legal Claims and Proceedings. From time to time, we have been subject to various claims and involved in legal proceedings incidental to the nature of our businesses. We maintain insurance coverage to reduce financial risk associated with certain of these claims and proceedings. It is not possible to predict the outcome of these claims and proceedings. However, in our opinion, there are no pending legal proceedings that are likely to have a material adverse effect on our consolidated financial statements. Product Claims. From time to time, in the ordinary course of our business, our customers may claim that the products that we distribute are either defective or require repair or replacement under warranties that either we or the manufacturer may provide to the customer. These proceedings are, in the opinion of management, ordinary and routine matters incidental to our normal business. Our purchase orders with our suppliers generally require the manufacturer to indemnify us against any product liability claims, leaving the manufacturer ultimately responsible for these claims. In many cases, state, provincial or foreign law provides protection to distributors for these sorts of claims, shifting the responsibility to the manufacturer. In some cases, we could be required to repair or replace the products for the benefit of our customer and seek our recovery from the manufacturer for our expense. In the opinion of management, the ultimate disposition of these claims and proceedings is not expected to have a material adverse effect on our consolidated financial statements. *Customer Contracts* We have contracts and agreements with many of our customers that dictate certain terms of our sales arrangements (pricing, deliverables, etc.). While we make every effort to abide by the terms of these contracts, certain provisions are complex and often subject to varying interpretations. Under the terms of these contracts, our customers have the right to audit our adherence to the contract terms. Historically, any settlements that have resulted from these customer audits have not been material to our consolidated financial statements. *Purchase Commitments* We have purchase obligations consisting primarily of inventory purchases made in the normal course of business to meet operating needs. While our vendors often allow us to cancel these purchase orders without penalty, in certain cases, cancellations may subject us to cancellation fees or penalties depending on the terms of the contract.

- Definition

The entire disclosure for commitments and contingencies.

+ References

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-Number 14
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Background and Basis of Presentation (Policies)	3 Months Ended
Background and Basis of Presentation (Policies)	Mar. 31, 2013
Accounting Policies [Abstract]
Business Operations	Business Operations: MRC Global Inc. is a holding company headquartered in Houston, Texas. Our wholly owned subsidiaries, McJunkin Red Man Corporation and its subsidiaries, are global distributors of pipe, valves, fittings (“PVF”) and related products and services across each of the upstream (exploration, production and extraction of underground oil and gas), midstream (gathering and transmission of oil and gas, gas utilities and the storage and distribution of oil and gas) and downstream (crude oil refining, petrochemical processing and general industrials) sectors. We have branches in principal industrial, hydrocarbon producing and refining areas throughout the United States, Canada, Europe, Asia and Australasia. Our products are obtained from a broad range of suppliers.
Basis of Presentation	Basis of Presentation: We have prepared our unaudited condensed consolidated financial statements in accordance with Rule 10-01 of Regulation S-X for interim financial statements. These statements do not include all information and footnotes that generally accepted accounting principles require for complete annual financial statements. However, the information in these statements reflects all normal recurring adjustments which are, in our opinion, necessary for a fair presentation of the results for the interim periods. The results of operations for the three months ended March 31, 2013 are not necessarily indicative of the results that will be realized for the fiscal year ending December 31, 2013. We have derived our condensed consolidated balance sheet as of December 31, 2012 from the audited financial statements for the year ended December 31, 2012. You should read these condensed consolidated financial statements in conjunction with the consolidated financial statements and notes thereto for the year ended December 31, 2012. The consolidated financial statements include the accounts of MRC Global Inc. and its wholly owned and majority owned subsidiaries (collectively referred to as the “Company” or by such terms as “we,” “our” or “us”). All material intercompany balances and transactions have been eliminated in consolidation.
Recently Issued Accounting Standards	Recently Issued Accounting Standards: In February 2013, the Financial Accounting Standards Board (“FASB”) issued Standards Update No. 2013-05, Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity (ASU 2013-05), which specifies that a cumulative translation adjustment (“CTA”) should be released into earnings when an entity ceases to have a controlling financial interest in a subsidiary or group of assets within a consolidated foreign entity and the sale or transfer results in the complete or substantially complete liquidation of the foreign entity. For sales of an equity method investment that is a foreign entity, a pro rata portion of CTA attributable to the investment would be recognized in earnings upon sale of the investment. When an entity sells either a part or all of its investment in a consolidated foreign entity, CTA would be recognized in earnings only if the sale results in the parent no longer having a controlling financial interest in the foreign entity. CTA would be recognized in earnings in a business combination achieved in stages. ASU 2013-05 is effective for us prospectively in 2014. We do not expect this update to have a material impact on our financial statements.

- Definition

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Principles Board Opinion (APB)
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Research Bulletin (ARB)
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Inventories (Tables)

3 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

Composition of Inventory

The composition of our inventory is as follows (in thousands):


	March 31,			December 31,
	2013			2012
Finished goods inventory at average cost:
Energy carbon steel tubular products	$	382,066		$	387,609
Valves, fittings, flanges and all other products		740,930			752,630

		1,122,996			1,140,239
Less: Excess of average cost over LIFO cost (LIFO reserve)		(147,910	)		(150,982	)
Less: Other inventory reserves		(19,618	)		(19,029	)

	$	955,468		$	970,228

Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Significant Components of Long-Term Debt

The components of our long-term debt are as follows (in thousands):


	March 31,		December 31,
	2013		2012
Senior secured term loan B, net of discount of $6,113 and $6,345	$	640,637	$	642,030
Global ABL Facility		425,980		608,006
Other		6,453		6,553

		1,073,070		1,256,589
Less current portion		6,500		6,500

	$	1,066,570	$	1,250,089

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.5-02.22)
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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2013

Equity [Abstract]

Accumulated Other Comprehensive Loss in Accompanying Consolidated Balance Sheets

Accumulated other comprehensive loss in the accompanying consolidated balance sheets consists of the following (in thousands):


	March 31,			December 31,
	2013			2012
Currency translation adjustments	$	(26,895	)	$	(21,829	)
Pension related adjustments		(335	)		(335	)

Accumulated other comprehensive loss	$	(27,230	)	$	(22,164	)

Earnings Per Share

Earnings per share are calculated in the table below (in thousands, except per share amounts).


	Three Months Ended
	March 31,		March 31,
	2013		2012
Net income	$	46,183	$	37,534

Average basic shares outstanding		101,609		84,437
Effect of dilutive securities		817		319

Average diluted shares outstanding		102,426		84,756

Net income per share:
Basic	$	0.45	$	0.44
Diluted	$	0.45	$	0.44

Segment Information (Tables)

3 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Schedule of Financial Information for Each Segment

The following table presents financial information for each segment (in millions):


	Three Months Ended
	March 31,			March 31,
	2013			2012
Sales
U.S.	$	965.6		$	1,052.7
Canada		204.5			208.2
International		135.0			121.7

Consolidated revenues	$	1,305.1		$	1,382.6

Operating income
U.S.	$	74.2		$	75.2
Canada		8.2			9.6
International		3.4			5.4

Total operating income		85.8			90.2
Interest expense		(15.3	)		(33.7	)
Other, net		0.7			2.1

Income before income taxes	$	71.2		$	58.6


	March 31,		December 31,
	2013		2012
Total assets
U.S.	$	2,688.7	$	2,732.4
Canada		223.3		249.1
International		405.6		388.2

Total assets	$	3,317.6	$	3,369.7

Schedule of Net Sales by Product Line

Our net sales by product line are as follows (in thousands):


	Three months ended
Type	March 31, 2013		March 31, 2012
Energy carbon steel tubular products:
Line pipe	$	261,625	$	290,353
Oil country tubular goods (OCTG)		126,115		221,221

	$	387,740	$	511,574

Valves, fittings, flanges and other products:
Valves and specialty products	$	362,718	$	331,832
Carbon steel fittings and flanges and stainless steel and alloy pipe and fittings		289,767		276,526
Other		264,875		262,700

	$	917,360	$	871,058

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Inventories - Composition of Inventory (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Finished goods inventory at average cost:
Finished goods inventory at average cost	$ 1,122,996	$ 1,140,239
Less: Excess of average cost over LIFO cost (LIFO reserve)	(147,910)	(150,982)
Less: Other inventory reserves	(19,618)	(19,029)
Inventories, net	955,468	970,228
Energy carbon steel tubular products [Member]
Finished goods inventory at average cost:
Finished goods inventory at average cost	382,066	387,609
Valves, fittings, flanges and all other products [Member]
Finished goods inventory at average cost:
Finished goods inventory at average cost	$ 740,930	$ 752,630

- Definition

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Paragraph 14
-Chapter 4
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Research Bulletin (ARB)
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 6
-Subparagraph a
-Article 5

+ Details

Long-Term Debt - Significant Components of Long-Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 1,073,070	$ 1,256,589
Less current portion	6,500	6,500
Long-term debt, net	1,066,570	1,250,089
Senior secured term loan [Member]
Debt Instrument [Line Items]
Long-term debt	640,637	642,030
Global ABL Facility [Member]
Debt Instrument [Line Items]
Long-term debt	425,980	608,006
Other [Member]
Debt Instrument [Line Items]
Long-term debt	$ 6,453	$ 6,553

Long-Term Debt - Significant Components of Long-Term Debt (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Senior secured term loan [Member]
Debt Instrument [Line Items]
Original issue discount on senior secured notes	$ 6,113	$ 6,345

Long-Term Debt - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2013 USD ($) Ratio	Dec. 31, 2012
Revolving credit facility [Member]
Debt Instrument [Line Items]
Maturity date of Term Loan	Mar. 31, 2017
Interest rate for the term loan	1.91%	2.21%
Total revolving credit facility	$ 1,250
Global ABL accordian feature	300
Availability under Global ABL Facility	560
Revolving credit facility [Member] \| U.S. [Member]
Debt Instrument [Line Items]
Total revolving credit facility	977
Revolving credit facility [Member] \| Canada [Member]
Debt Instrument [Line Items]
Total revolving credit facility	170
Revolving credit facility [Member] \| United Kingdom [Member]
Debt Instrument [Line Items]
Total revolving credit facility	12
Revolving credit facility [Member] \| Australia [Member]
Debt Instrument [Line Items]
Total revolving credit facility	75
Revolving credit facility [Member] \| Netherlands [Member]
Debt Instrument [Line Items]
Total revolving credit facility	9
Revolving credit facility [Member] \| Belgium [Member]
Debt Instrument [Line Items]
Total revolving credit facility	7
Senior Secured Term Loan B [Member]
Debt Instrument [Line Items]
New Term Loan	$ 650
Debt maturity period	7 years
Term Loan accordion feature	$ 200
Maturity date of Term Loan	Nov. 30, 2019
Term loan annual amortization percentage	1.00%
Percentage of capital stock in foreign subsidiaries	65.00%
Repayment of Term Loan, Minimum percentage	0.00%
Repayment of Term Loan, Maximum percentage	50.00%
Interest rate for the term loan	6.39%	6.39%
Senior Secured Term Loan B [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Senior secured leverage ratio \| Ratio	1.00
Senior Secured Term Loan B [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Senior secured leverage ratio \| Ratio	3.50

Stockholders' Equity - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Shares reserved for Incentive Plan	3,250,000
Stock options issued or granted	1,793,969
Restricted stock issued	87,914
2011 Omnibus Incentive Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Maximum term for stock option plan grant	10 years
Stock options issued or granted	641,294
Anti-dilutive stock options	600,000	2,300,000
2011 Omnibus Incentive Plan [Member] \| Minimum [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Vesting period	4 years
2011 Omnibus Incentive Plan [Member] \| Maximum [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Vesting period	5 years
2011 Omnibus Incentive Plan [Member] \| Director [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Vesting period	1 year

Stockholders' Equity - Accumulated Other Comprehensive Loss in Accompanying Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Currency translation adjustments	$ (26,895)	$ (21,829)
Pension related adjustments	(335)	(335)
Accumulated other comprehensive loss	$ (27,230)	$ (22,164)

- Definition

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (j-k)
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 14A
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 5
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 12, 13
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-Number 133
-Paragraph 45
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
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-Subparagraph a
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Paragraph 14
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 31
-Article 5

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-Name FASB Staff Position (FSP)
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 26
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Stockholders' Equity - Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Net income	$ 46,183	$ 37,534
Average basic shares outstanding	101,609	84,437
Effect of dilutive securities	817	319
Average diluted shares outstanding	102,426	84,756
Net income per share:
Basic	$ 0.45	$ 0.44
Diluted	$ 0.45	$ 0.44

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
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-Name Regulation S-X (SX)
-Number 210
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-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Emerging Issues Task Force (EITF)
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Segment Information - Additional Information (Detail)	3 Months Ended
Segment Information - Additional Information (Detail)	Mar. 31, 2013 Segment
Segment Reporting [Abstract]
Number of operating segments	3

Segment Information - Schedule of Financial Information for Each Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Sales
Consolidated revenues	$ 1,305,100	$ 1,382,632
Operating income
Total operating income	85,814	90,177
Interest expense	(15,302)	(33,717)
Other, net	700	2,100
Income before income taxes	71,195	58,647
Total assets
Total assets	3,317,595		$ 3,369,727
U.S. [Member]
Sales
Consolidated revenues	965,600	1,052,700
Operating income
Total operating income	74,200	75,200
Total assets
Total assets	2,688,700		2,732,400
Canada [Member]
Sales
Consolidated revenues	204,500	208,200
Operating income
Total operating income	8,200	9,600
Total assets
Total assets	223,300		249,100
International [Member]
Sales
Consolidated revenues	135,000	121,700
Operating income
Total operating income	3,400	$ 5,400
Total assets
Total assets	$ 405,600		$ 388,200

Segment Information - Schedule of Net Sales by Product Line (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Net Sales	$ 917,360	$ 871,058
Other [Member]
Segment Reporting Information [Line Items]
Net Sales	264,875	262,700
Energy carbon steel tubular products [Member]
Segment Reporting Information [Line Items]
Net Sales	387,740	511,574
Energy carbon steel tubular products [Member] \| Line pipe [Member]
Segment Reporting Information [Line Items]
Net Sales	261,625	290,353
Energy carbon steel tubular products [Member] \| Oil country tubular goods (OCTG) [Member]
Segment Reporting Information [Line Items]
Net Sales	126,115	221,221
Valves, fittings, flanges and all other products [Member] \| Valves and specialty products [Member]
Segment Reporting Information [Line Items]
Net Sales	362,718	331,832
Valves, fittings, flanges and all other products [Member] \| Carbon steel fittings and flanges and stainless steel and alloy pipe and fittings [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 289,767	$ 276,526

Fair Value Measurements - Additional Information (Detail) - USD ($)	Mar. 31, 2013	Dec. 31, 2012
Long-term Debt [Member]
Fair Value Disclosures [Line Items]
Carrying value of debt	$ 1,073,000,000	$ 1,257,000,000
Long-term Debt [Member] \| Level 2 [Member]
Fair Value Disclosures [Line Items]
Fair value of our debt	1,080,000,000	1,261,000,000
Foreign exchange forward contracts [Member]
Fair Value Disclosures [Line Items]
Notional amount of forward foreign exchange contracts	58,000,000	69,000,000
Foreign exchange forward contracts [Member] \| Level 2 [Member]
Fair Value Disclosures [Line Items]
Fair value of forward foreign exchange contracts	$ 570,000	$ 3,000

Commitments and Contingencies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2013 Claim LawSuits
Commitments And Contingencies Disclosure [Abstract]
Asbestos related pending claims \| Claim	903
Number of lawsuits \| LawSuits	266