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Share-Based Compensation Plans - Summary of Outstanding and Exercisable Stock Option Awards (Detail)
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Minimum $ 8.49
Range of Exercise Prices, Maximum $ 18.70
Options Outstanding, Shares | shares 3,282,718
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 8 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price $ 12.72
Options Exercisable, Shares | shares 25,828
Options Exercisable, Weighted-Average Exercise Price $ 8.49
Range One [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Minimum $ 8.49
Options Outstanding, Shares | shares 25,828
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 2 years 6 months
Options Outstanding, Weighted-Average Exercise Price $ 8.49
Options Exercisable, Shares | shares 25,828
Options Exercisable, Weighted-Average Exercise Price $ 8.49
Range Two [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Minimum $ 10.87
Options Outstanding, Shares | shares 2,246,400
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 7 years 10 months 25 days
Options Outstanding, Weighted-Average Exercise Price $ 10.87
Range Three [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Minimum 11.00
Range of Exercise Prices, Maximum $ 16.04
Options Outstanding, Shares | shares 84,500
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 9 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price $ 12.73
Range Four [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Minimum $ 16.53
Options Outstanding, Shares | shares 583,200
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 8 years 6 months
Options Outstanding, Weighted-Average Exercise Price $ 16.53
Range Five [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Minimum 17.68
Range of Exercise Prices, Maximum $ 18.70
Options Outstanding, Shares | shares 342,790
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 8 years 10 months 25 days
Options Outstanding, Weighted-Average Exercise Price $ 18.68