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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Liability for unrecognized tax benefits $ 24,214 $ 39,011
Decrease in liability for unrecognized tax benefits 14,797  
Accrued interest and penalties related to unrecognized tax benefits, net of federal tax benefits $ 3,763 $ 9,918