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Income Taxes - Schedule of Differences Between Effective Rate and United States Federal Income Tax Statutory Rate (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Tax at statutory rate | 21.00% | 35.00% | 35.00%
State income tax, net of federal benefit | 4.80% | 3.33% | 2.94%
Non-deductible expenses | 0.44% | 0.49% | 0.43%
Change in accrual estimates relating to uncertain tax positions | 0.05% | 0.02% | (2.11%)
Change in valuation allowance |  |  | 0.48%
Other, net | 1.20% | 0.16% | 0.06%
Change in tax law | (0.32%) | (17.06%) |
Income tax provision | 27.17% | 21.94% | 36.80%

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