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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Federal tax at statutory rate (as a percent) |  |  | 21.00% | 35.00%
Benefits associated with stock-based awards | $ 7.7 | $ 3.2 | $ 14.2 | $ 17.1

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