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v3.20.4

Reconciliation of Effective Tax Rate to Federal Statutory Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
United States federal statutory rate | 21.00% | 21.00% | 21.00%
Federal tax law changes |  |  | 0.50%
State taxes, net of federal benefit | 3.60% | 3.50% | 3.70%
Federal and state incentives | (1.10%) | (0.90%) | (0.90%)
State law changes | (0.20%) | 0.70% |
Permanent differences | 0.20% | 1.20% | 0.60%
Net effective rate | 23.50% | 25.50% | 24.90%

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