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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 [Line Items] |  |  |  |
Effective tax rate | 14.10% | 15.90% | 14.00% | 14.60%
Income tax expense (benefit) | $ 34,503 | $ 38,412 | $ 64,704 | $ 63,361
Excess tax benefit recognized | $ 30,727 | $ 26,456 | $ 59,205 | $ 46,022

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