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Income Taxes - Provision for Income Taxes Attributable to Income from Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax at U.S. federal statutory rates									$ 19,507	$ 16,766	$ 26,012
State taxes (net of federal benefit)									4,774	3,745	2,724
Business meals and entertainment — non-deductible									987	915	820
Change in valuation allowance									932	264	221
Reserves for uncertain tax positions									(263)	(1,124)	(35)
Share-based compensation									(4,773)	(3,260)	(3,837)
Impact of the Tax Cuts and Jobs Act of 2017											(2,487)
Non-deductible expenses									713	785	236
Other, net									(37)	176	(366)
Provision for income taxes from continuing operations	$ (3,164)	$ 6,069	$ 5,322	$ 13,613	$ (1,424)	$ 3,297	$ 3,238	$ 13,156	$ 21,840	$ 18,267	$ 23,288
Effective income tax rate									23.50%	22.90%	31.30%

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