Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Contribution Plan [Member] | 401(k) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution expense	$ 3.8	$ 4.1	$ 3.5