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Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Noncurrent contract assets	$ 119,200
Noncurrent contract liabilities	58,100
Provisions for loss contracts	81,500		$ 71,200
Net income (loss) attributable to noncontrolling interest	459	$ (909)
Interest expense, net	44,569	20,284
Other (expense) income, net	$ (8,228)	$ 2,586
Transferred at Point in Time
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue derived from performance obligations satisfied when control passes to customer (as a percent)	75.00%

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