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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Tax Examination [Line Items] |  |  |  |
Effective tax rates | 19.40% | 15.00% | 19.60% | 6.50%
Discrete tax benefit recorded | $ (11,604) | $ (10,368) | $ (18,964) | $ (7,582)
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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