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Equity-Based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized common stock	8,200,000		8,200,000
Annual increments in employee grants			25.00%
Equity incentive plan available for future grant	1,067,730		1,067,730
Stock options, contractual term			10 years
Equity-based compensation expense	$ 5,471,000	$ 4,039,000	$ 16,258,000	$ 14,322,000
Unrecognized compensation expense related to unvested options			$ 41,800,000
Vesting period			1 year 3 months 18 days
Warrant outstanding	0		$ 0
Deferred income tax benefit			41,803,000	5,150,000
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred income tax benefit	$ 1,400,000	$ 1,300,000	$ 4,300,000	$ 4,100,000
Restricted Stock Award [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Restricted Stock Award [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Restricted Stock Units [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			2 years
Number of shares issuable at the end of the vesting period, percentage			0.00%
Restricted Stock Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Number of shares issuable at the end of the vesting period, percentage			200.00%

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