Income Taxes - Provision for Income Taxes Attributable to Income from Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax at statutory rate (35%)									$ 23,452	$ 20,241	$ 17,699
State taxes (net of federal benefit)									2,643	2,899	3,361
Business meals and entertainment — non-deductible									784	779	667
Reserves for uncertain tax positions									(87)	(324)	(1,724)
Net change in tax rate									(64)	(1,046)	(214)
Other, net									(329)	280	365
Provision for income taxes from continuing operations	$ (967)	$ 7,260	$ 5,306	$ 14,800	$ (2,226)	$ 6,787	$ 4,696	$ 13,572	$ 26,399	$ 22,829	$ 20,154
Effective income tax rate									39.40%	39.50%	39.90%