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Stock-Based Compensation Plans - Summary of Stock Options Issued Pursuant to Stock Incentive Plans (Detail)
 9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Number of Shares  
Outstanding, Beginning Balance | shares 6,162,717
Granted | shares 170,455
Exercised | shares (1,262,994)
Forfeited | shares (81,881)
Outstanding, Ending Balance | shares 4,988,297
Number of Shares Exercisable, Ending Balance | shares 3,533,425
Weighted-Average Exercise Price  
Beginning Balance | $ / shares $ 16.83
Granted | $ / shares 23.36
Exercised | $ / shares 14.57
Forfeited | $ / shares 18.62
Ending Balance | $ / shares 17.60
Weighted-Average Exercise Price Exercisable, Ending Balance | $ / shares $ 16.84
Weighted-Average Remaining Contractual Term (Years)  
Weighted Average Remaining Contractual Term (Years), Outstanding as of end of period 6 years 3 months 19 days
Weighted-Average Remaining Contractual Term (Years), Exercisable as of end of period 5 years 7 months 21 days
Aggregate Intrinsic Value of In-the-Money Options  
Aggregate Intrinsic Value of In-the-Money Options, Outstanding as of end of period | $ $ 52,585,398
Aggregate Intrinsic Value of In-the-Money Options, Exercisable as of end of period | $ $ 39,930,860