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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation related to equity awards and restricted stock $ 1,831 $ 3,606 $ 8,592 $ 12,040
Proceeds from exercise of common stock options     350 $ 1,107
Unrecognized compensation cost related to options 3,400   $ 3,400  
Options Available for Future Grant [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Recognized weighted-average period     2 years 2 months 12 days  
Restricted Stock and RSUs [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Recognized weighted-average period     2 years 4 months 24 days  
Unrecognized compensation cost related to restricted stock and RSUs $ 6,345   $ 6,345