Revenue Recognition - Schedule of Changes in Contract Balances Due to Adoption of New Accounting Standards (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Revenue From Contract With Customer [Abstract]
Contract assets	$ 139,860	$ 142,337
Contract liabilities	(36,473)	(37,413)
Net contract assets (liabilities)	103,387	$ 104,924
Change in contract assets	(2,477)
Change in contract liabilities	940
Change in net contract assets (liabilities)	$ (1,537)
Percentage of change in contract assets	(1.70%)
Percentage of change in contract liabilities	(2.50%)
Percentage of change in net contract assets (liabilities)	(1.50%)