Significant Accounting Policies - Additional Information (Detail) $ in Thousands	1 Months Ended	12 Months Ended
	Apr. 30, 2017 USD ($)	Dec. 31, 2018 USD ($) Facility	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2019 USD ($)	Jan. 01, 2018 USD ($)
Significant Accounting Policies [Line Items]
Number of manufacturing facilities | Facility		51
Net profit change on contracts		$ (62,046)	$ 211,080
Cash paid for debt prepayment	$ 31,600
Goodwill impairment		$ 182,542	0	$ 0
Maturity period of highly liquid investments		three months or less
Goodwill impairment		$ 182,542	$ 0	$ 0
Land and buildings | Minimum
Significant Accounting Policies [Line Items]
Estimated useful lives		15 years
Land and buildings | Maximum
Significant Accounting Policies [Line Items]
Estimated useful lives		40 years
Machinery and equipment | Minimum
Significant Accounting Policies [Line Items]
Estimated useful lives		3 years
Machinery and equipment | Maximum
Significant Accounting Policies [Line Items]
Estimated useful lives		12 years
Joint Venture
Significant Accounting Policies [Line Items]
Investment in joint venture		49.00%
Accounting Standards Update 2014-09
Significant Accounting Policies [Line Items]
Net profit change on contracts						$ 100
Subsequent Event | Scenario, Forecast | Accounting Standards Update 2016-02 | Minimum
Significant Accounting Policies [Line Items]
Operating lease, right-of-use asset					$ 65,000
Operating lease, liability					65,000
Subsequent Event | Scenario, Forecast | Accounting Standards Update 2016-02 | Maximum
Significant Accounting Policies [Line Items]
Operating lease, right-of-use asset					95,000
Operating lease, liability					$ 95,000