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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
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Income Tax Contingency [Line Items] |  |
Gross unrecognized tax benefits | $ 16.1 | $ 14.2
Unrecognized tax benefits that would impact effective tax rate | 13.0 |
Minimum [Member] |  |
Income Tax Contingency [Line Items] |  |
Gross unrecognized tax benefits balance may decrease within the next twelve months | 0.0 |
Maximum [Member] |  |
Income Tax Contingency [Line Items] |  |
Gross unrecognized tax benefits balance may decrease within the next twelve months | $ 0.9 |

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