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Difference Between Statutory Federal Income Tax Rate and Effective Income Rate (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Statutory tax rate | 21.00% | 21.00% | 21.00%
State income taxes - net of the federal income tax benefit | 1.70% | 1.40% | 1.10%
Goodwill impairment | (8.20%) | (0.70%) | (6.90%)
Permanent differences | (0.60%) | (1.20%) | (0.70%)
Tax effects of tax reform |  |  | (1.30%)
Valuation allowance | (0.20%) | (0.80%) | (3.70%)
State deferred tax remeasurement |  | (1.10%) | 2.30%
Other differences, net |  | 1.10% | 0.70%
Effective tax rate | 13.70% | 19.70% | 12.50%

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