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Stock Compensation - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 29, 2015
Jan. 31, 2014
Dec. 31, 2015
Sep. 30, 2015
Jul. 31, 2015
Jun. 30, 2015
Jul. 31, 2014
Jul. 31, 2013
Mar. 31, 2012
Jun. 30, 2009
Jun. 30, 2008
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2016
Jun. 25, 2014
Mar. 31, 2013
Dec. 31, 1997
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Stock options, expiration period                       10 years            
Total unrecognized compensation cost related to non vested stock options outstanding     $ 12.5                 $ 12.5            
Stock Option Plan 2014                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Shares available for awards under the plan     9,632,924                 9,632,924            
Employee Stock Purchase Plan                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Reserved common stock for issuance under the plan                                   500,000
Additional shares of common stock reserved           750,000       750,000 500,000              
Payroll withholding period for purchase of shares of common stock                     3 months              
Shares of common stock issued under the plan                       288,056 250,776 101,300        
Minimum | Employee Stock Purchase Plan                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Purchase price of common stock by employees                     85.00%              
Stock options                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Stock options, expiration period                       10 years            
Weighted average period of compensation cost expected to be recognized                       2 years 3 months 18 days            
Stock options | Minimum                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Stock options, vesting period                       3 years            
Stock options | Maximum                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Stock options, vesting period                       4 years            
Stock and stock units                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Total fair value of stock and stock unit awards vested                       $ 11.8 $ 5.2 $ 25.5        
Number of performance share units vested in period                       1,884,937            
Number of performance share units granted in period                       3,042,995            
Number of performance share units     4,493,054                 4,493,054 3,503,153          
Restricted shares or units                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Weighted average period of compensation cost expected to be recognized                       1 year 7 months 6 days            
Unrecognized compensation expense     $ 11.6                 $ 11.6            
Performance share units                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Number of performance share units vested in period     47,500 58,000 121,200   129,200 274,400                    
Vesting date         2015-07   2014-07 2013-07                    
Number of performance share units granted in period                 524,800                  
Number of performance share units 731,300 997,000 630,000                 630,000       47,000 316,000  
Number of performance shares units expected to vest 101,300                                  
Award vesting year 2015 2015                                
Performance share units | Dependent upon the achievement of specific commercial objectives by the end of 2015                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Award vesting percent dependent upon achievement of specific commercial objectives 50.00% 50.00%                                
Performance share units | Subsequent Event                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Number of performance shares units expected to vest                             110,500      
Performance share units | Maximum                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Percentage of Compensation Expense                       60.00%