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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2019
Income Taxes [Line Items] |  |  |  |  |
Income tax expense | $ 7,750 | $ 13,787 | $ 34,983 | $ 40,595 |
Effective tax rate | 27.80% | 26.90% | 26.40% | 24.70% |
Statutory Effective Tax Rate [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
U.S. federal statutory rate |  |  | 21.00% |  |
State income tax rate, net of federal benefit |  |  | 3.60% |  |
Forecast [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Effective tax rate |  |  |  |  | 27.10%

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