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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
Income Tax Disclosure [Abstract] |  |  |  |
Provision (benefit) for income taxes for continuing operations | $ 9,619,000 | $ 6,866,000 | $ 17,153,000 | $ 14,710,000
Effective income tax rate | 40.75% | 37.37% | 40.66% | 39.56%
Valuation allowance | $ 0 |  | $ 0 |

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