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Income Taxes (Additional Information) (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Provision for income taxes | $ 28,913,000 | $ 29,769,000 | $ 55,842,000 | $ 59,443,000
Effective tax rate | 29.40% | 29.30% | 29.20% | 28.90%
Minimum |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Reasonably possible change in unrecognized tax benefits over next 12 months | $ 0 |  | $ 0 |
Maximum |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Reasonably possible change in unrecognized tax benefits over next 12 months | $ 2,200,000 |  | $ 2,200,000 |

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