Income Taxes - Schedule of Reconciliation between Statutory Income Tax Rate and Company's Effective Income Tax Provision (Benefit) Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income tax at federal statutory rates	21.00%	21.00%	35.00%
State taxes, net of federal benefit	5.93%	7.40%	2.02%
Equity-based compensation	(1.38%)	1.07%	(1.01%)
Tax credits	(0.62%)	(1.95%)	0.25%
Goodwill impairment			(6.12%)
Remeasurement of deferred income tax liabilities resulting from Tax Cuts and Jobs Act			0.63%
Impact of state rate changes	2.92%	(0.60%)	(0.02%)
Nondeductible settlement		1.34%
Valuation allowance - state	1.90%		(0.59%)
Other	0.89%	0.31%	(0.58%)
Income tax provision (benefit) rate	30.64%	28.57%	29.58%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax at federal statutory rates	$ 27,091	$ 13,167	$ (100,587)
State taxes, net of federal benefit	7,645	4,640	(5,800)
Equity-based compensation	(1,776)	668	2,901
Tax credits	(795)	(1,221)	(730)
Goodwill impairment			17,584
Remeasurement of deferred income tax liabilities resulting from Tax Cuts and Jobs Act			(1,808)
Impact of state rate changes	3,770	(379)	(53)
Nondeductible settlement		840
Valuation allowance - state	2,455		1,688
Other	1,138	200	1,799
Total income tax provision (benefit)	$ 39,528	$ 17,915	$ (85,006)