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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective Federal Statutory Income Tax Rate, Percent | 31.10% | 26.20% | 31.30% |  |
Liability for unrecognized tax benefits | $ 40,376 |  |  | $ 40,376 | $ 32,776
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 37,533 |  |  | 37,533 |
Increase in liability for unrecognized tax benefits |  |  |  | 7,600 |
Accrued interest and penalties related to unrecognized tax benefits, net of federal tax benefits | $ 8,296 |  |  | $ 8,296 | $ 4,195

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