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Income Tax - Reconciliation of U.S. Statutory Income Tax Rate to Effective Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal income tax expense at statutory rate	$ 32,733	$ 57,209	$ 47,480
State income tax, net of federal income tax benefit	7,953	4,754	5,091
Domestic production activities deduction	0	(2,617)	(3,947)
Excess tax benefits related to stock option exercises	(32,487)	(40,624)	(29,582)
Tax Act adjustments	(1,750)	(25,992)	0
Tax credits	(3,715)	(3,578)	0
Non-deductible business expenses	5,655	4,573	2,979
Other, net	19	160	(64)
Income tax expense benefit	$ 8,408	$ (6,115)	$ 21,957

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