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Income Taxes - Schedule of Effective Income Tax Reconciliation (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal tax expense at statutory rate	21.00%	35.00%	21.00%	35.00%	35.00%
Increase (reduction) in income taxes resulting from:
State tax, net of federal benefit	3.50%	2.80%	3.40%	2.60%
Excess tax benefits from share-based awards	(1.50%)	(0.40%)	(1.40%)	(7.50%)
Other	0.50%	0.50%	0.60%	0.70%
Effective tax rate	23.50%	37.90%	23.60%	30.80%
Federal tax expense at statutory rate	$ 2,327	$ 3,460	$ 4,709	$ 6,967
Increase (reduction) in income taxes resulting from:
State tax, net of federal benefit	389	278	768	524
Excess tax benefits from share-based awards	(170)	(36)	(308)	(1,488)
Other	55	49	129	133
Total	$ 2,601	$ 3,751	$ 5,298	$ 6,136

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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