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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] |  |  |  |
Retroactive tax relief |  |  |  | $ 500,000
Provisions for income taxes | $ (2,415,000) | $ 6,345,000 | $ 12,286,000 | $ 9,967,000
Percentage of pre-tax income |  |  | 39.00% | 38.00%

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