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Income Taxes (Additional Information) (Detail) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Provision for income taxes | $ 28,528,000 | $ 24,682,000
Effective tax rate | 27.30% | 26.60%
Minimum |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Reasonably possible change in unrecognized tax benefits over next 12 months | $ 0 |
Maximum |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Reasonably possible change in unrecognized tax benefits over next 12 months | $ 2,400,000 |

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