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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation   $ 10,393 $ 5,836
CEO [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation $ 4,100    
Salaries and benefits associated with separation costs $ 2,000