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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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Interim Reporting [Line Items]

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

+ References

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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