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Business Segments - Schedule of Comparison of Approximate Sales Mix in Principal Product Categories (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues | $ 669 | $ 697 | $ 651 | $ 631 | $ 538 | $ 520 | $ 501 | $ 548 | $ 2,648 | $ 2,107 | $ 3,010
Drilling and Production [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 625 | 496 | 632
Pipe [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 418 | 287 | 509
Valves [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 541 | 374 | 538
Fittings and Flanges [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 419 | 350 | 448
Mill Tool, MRO, Safety and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 645 | $ 600 | $ 883

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