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Income Taxes - Provision for Income Taxes Attributable to Income from Continuing Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax at U.S. federal statutory rates |  |  |  |  |  |  |  |  | $ 16,766 | $ 26,012 | $ 23,452
State taxes (net of federal benefit) |  |  |  |  |  |  |  |  | 4,035 | 2,945 | 2,643
Business meals and entertainment — non-deductible |  |  |  |  |  |  |  |  | 915 | 820 | 784
Reserves for uncertain tax positions |  |  |  |  |  |  |  |  | (1,124) | (35) | (87)
Share-based compensation |  |  |  |  |  |  |  |  | (3,260) | (3,837) |
Impact of the Tax Cuts and Jobs Act of 2017 |  |  |  |  |  |  |  |  |  | (2,487) |
Non-deductible expenses |  |  |  |  |  |  |  |  | 785 | 236 | 22
Other, net |  |  |  |  |  |  |  |  | 150 | (366) | (415)
Provision for income taxes from continuing operations | $ (1,424) | $ 3,297 | $ 3,238 | $ 13,156 | $ (3,368) | $ 6,172 | $ 4,343 | $ 16,141 | $ 18,267 | $ 23,288 | $ 26,399
Effective income tax rate |  |  |  |  |  |  |  |  | 22.90% | 31.30% | 39.40%

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