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Reconciliation of Effective Tax Rate to Federal Statutory Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	21.00%	34.90%	35.00%
Federal tax law changes	0.50%	(112.20%)
State taxes, net of federal benefit	3.70%	2.80%	2.70%
Federal and state incentives	(0.90%)	(7.00%)	(0.40%)
State law changes		2.00%	0.40%
Permanent differences	0.60%	0.20%	1.00%
Net effective rate	24.90%	(79.30%)	38.70%

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Effective income tax rate reconciliation change in federal law tax rate.

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Effective income tax rate reconciliation federal and state incentives.

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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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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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