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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax Disclosure [Abstract]        
Provisions (benefit) for income taxes $ (41) $ 7,047 $ 4,140 $ 14,701
Percentage of pre-tax income     37.00% 39.00%