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Income Taxes (Additional Information) (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Income Tax Disclosure [Abstract] |  |  |  |
Provision for income taxes | $ 29,889,000 | $ 22,812,000 | $ 89,332,000 | $ 72,774,000
Effective tax rate | 29.50% | 26.30% | 29.10% | 27.90%
Reasonably possible change in unrecognized tax benefits over next 12 months, lower range | 0 |  | 0 |
Reasonably possible change in unrecognized tax benefits over next 12 months, upper range | $ 1,000,000 |  | $ 1,000,000 |

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