Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Contract Assets and Liabilities (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Contract assets	$ 50,100,000	$ 41,000,000.0
Contract liabilities	27,500,000	32,600,000
Net contract assets	22,600,000	$ 8,400,000
$ Change
Contract assets	9,100,000
Contract liabilities	(5,100,000)
Net contract assets	$ 14,200,000
% Change
Contract assets	22.20%
Contract liabilities	(15.60%)
Net contract assets	169.00%
Percent of contract liabilities		85.00%
Impairment losses on contract assets	$ 0	$ 0	$ 0