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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |  |
Provision for income taxes increased | $ 7,150 | $ 2,210 | $ 16,371 | $ 10,060 |  |
Effective income tax rate | 21.70% | 16.00% | 23.30% | 29.80% |  |
Federal corporate tax rate |  |  | 21.00% |  |  | 35.00%
Scenario, Plan [Member] | Minimum [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Effective income tax rate |  |  |  |  | 23.00% |
Scenario, Plan [Member] | Maximum [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Effective income tax rate |  |  |  |  | 24.00% |

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