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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Tax Examination [Line Items] |  |  |  |
Effective tax rates | 13.80% | 15.90% | 17.60% | 9.50%
Discrete tax benefit recorded | $ (6,837) | $ (8,757) | $ (25,801) | $ (16,339)
Change in Accounting Method Accounted for as Change in Estimate [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Discrete tax benefit recorded |  |  |  | $ 10,500

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