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Stock-Based Compensation - Schedule of Stock Options and Awards (Detail) - shares
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares available for grant 3,254,051      
Standard and market condition stock options outstanding        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Standard and market condition based stock options outstanding 3,550,072      
Restricted stock awards outstanding        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awards and units outstanding 44,538 77,540 21,356 35,364
RSUs outstanding        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awards and units outstanding 508,880 427,192 487,423 564,891