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Net Sales and Operating Loss Related to Fairborn Acquisition (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 284,713 | $ 359,371 | $ 376,315 | $ 366,121 | $ 278,663 | $ 302,395 | $ 332,658 | $ 297,504 | $ 1,386,520 | $ 1,211,220 | $ 1,143,492
Operating Income (Loss) |  |  |  |  |  |  |  |  | $ 382,175 | 354,431 | $ 270,700
Fairborn Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 7,022 |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | $ (2,394) |

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