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Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Income Tax Disclosure [Abstract] |  |
Provision (benefit) for income taxes | $ 7,653,000 | $ 4,684,000
Effective income tax rate | 41.00% | 31.70%
Income tax expense includes increase in unrecognized tax benefit and stock based compensation | 100,000 |
Income tax expense includes discrete items |  | $ 779,000
Income tax years under examination | December 31, 2004 through 2012 |

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