Revenue Recognition - Schedule of Changes in Contract Balances Due to Adoption of New Accounting Standards (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Contract assets	$ 153,055	$ 126,688
Contract liabilities	(32,086)	(33,494)
Net contract assets (liabilities)	120,969	$ 93,194
Change in contract assets	26,367
Change in contract liabilities	1,408
Change in net contract assets (liabilities)	$ 27,775
Percentage of change in contract assets	20.80%
Percentage of change in contract liabilities	(4.20%)
Percentage of change in net contract assets (liabilities)	29.80%