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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory U.S. federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	3.20%	3.20%	3.30%
State tax credits, net of federal effect	(0.70%)	(1.50%)	(1.20%)
Excess tax benefits	(5.80%)	(0.00%)	(0.00%)
Deferred tax revaluation (Federal Rate change)	(3.70%)	0.00%	0.00%
Nondeductible expenses	0.00%	0.20%	0.10%
Other	0.30%	0.20%	(0.10%)
Effective income tax rate	28.30%	37.10%	37.10%

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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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