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Reconciliation of Effective Tax Rate to Federal Statutory Tax Rate (Detail) | 12 Months Ended
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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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