Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Percentage of employee contribution	30.00%
Defined contribution plan, cost recognized	$ 11.5	$ 9.3	$ 7.9
Maximum
Defined Benefit Plan Disclosure [Line Items]
Percentage of employer contribution	3.00%