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Stock-Based Compensation - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation $ 13,128,000 $ 8,664,000
CEO [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation 4,100  
Stock-based compensation expense $ 2,000,000