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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Statutory tax rate | 21.00% | 35.00% | 35.00%
State income taxes - net of the federal income tax benefit | 1.20% | 1.90% | 2.00%
Goodwill impairment | (6.90%) |  |
Permanent differences | (0.60%) | (1.30%) | (0.10%)
Tax effects of tax reform | (1.30%) | 66.70% |
Share-based payments | (0.10%) | 3.60% |
Acquisition related differences |  | (3.30%) |
Valuation allowance | (3.70%) |  |
State deferred tax remeasurement | 2.30% |  |
Other differences, net | 0.60% | (0.80%) | (1.10%)
Effective tax rate | 12.50% | 101.80% | 35.80%

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