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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
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Mar. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |
Liability for unrecognized tax benefits | $ 48,384 | $ 40,382
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 45,541 |
Increase in liability for unrecognized tax benefits | 8,002 |
Accrued interest and penalties related to unrecognized tax benefits, net of federal tax benefits | $ 9,903 | $ 9,019

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