Revenue Recognition - Schedule of Changes in Contract Balances Due to Adoption of New Accounting Standards (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Revenue From Contract With Customer [Abstract]
Contract assets	$ 154,804	$ 143,369
Contract liabilities	(38,108)	(42,050)
Net contract assets (liabilities)	116,696	$ 101,319
Change in contract assets	11,435
Change in contract liabilities	3,942
Change in net contract assets (liabilities)	$ 15,377
Percentage of change in contract assets	8.00%
Percentage of change in contract liabilities	(9.40%)
Percentage of change in net contract assets (liabilities)	15.20%