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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory U.S. federal income tax rate	21.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	4.00%	3.20%	3.20%
State tax credits, net of federal effect	(1.00%)	(0.70%)	(1.50%)
Excess tax benefits	(3.70%)	(5.80%)
Deferred tax revaluation (Federal Rate change)		(3.70%)
Nondeductible expenses	0.40%		0.20%
Other	(0.50%)	0.30%	0.20%
Effective Income Tax Rate Reconciliation, Percent, Total	20.20%	28.30%	37.10%

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Effective income tax rate reconciliation excess tax benefit.

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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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