Contract Assets, Contract Liabilities and Contract Costs and Net Sales - Summary of Changes in Contract Assets and Contract Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Change In Contract With Customer Asset And Liability [Abstract]
Contract with customer assets	$ 596	$ 580
Contract with customer assets change	$ 16
Contract with customer assets percentage change	2.80%
Contract with customer liabilities	$ 863,053	$ 905,284
Contract with customer liabilities change	$ (42,231)
Contract with customer liabilities percentage change	(4.70%)