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Interim Financial Statements - Additional Information (Detail) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Apr. 30, 2017 USD ($) | Mar. 31, 2018 USD ($) Facility | Mar. 31, 2017 USD ($)
Interim Reporting [Line Items] |  |  |
Number of manufacturing facilities | Facility |  | 44 |
Net profit change on contracts |  | $ (5,983) | $ 7,411
Cash paid for debt prepayment | $ 31,600 |  |
Maximum [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Interim Reporting [Line Items] |  |  |
Net profit change on contracts |  | $ 100 |

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