XML 50 R39.htm IDEA: XBRL DOCUMENT v3.7.0.1
Stock-Based Compensation Plans - Summary of Stock Options Issued Pursuant to Stock Incentive Plans (Detail)
 6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Number of Shares  
Outstanding, Beginning Balance | shares 6,791,375
Granted | shares 864,800
Exercised | shares (608,157)
Forfeited | shares (186,190)
Expired | shares (17,507)
Outstanding, Ending Balance | shares 6,844,321
Number of Shares Exercisable, Ending Balance | shares 4,086,269
Weighted-Average Exercise Price  
Beginning Balance | $ / shares $ 15.54
Granted | $ / shares 20.12
Exercised | $ / shares 13.07
Forfeited | $ / shares 18.50
Expired | $ / shares 20.36
Ending Balance | $ / shares 16.25
Weighted-Average Exercise Price Exercisable, Ending Balance | $ / shares $ 14.50
Weighted-Average Remaining Contractual Term (Years)  
Weighted Average Remaining Contractual Term (Years), Outstanding as of end of period 6 years 9 months 18 days
Weighted-Average Remaining Contractual Term (Years), Exercisable as of end of period 5 years 6 months
Aggregate Intrinsic Value of In-the-Money Options  
Aggregate Intrinsic Value of In-the-Money Options, Outstanding as of end of period | $ $ 41,895,512
Aggregate Intrinsic Value of In-the-Money Options, Exercisable as of end of period | $ $ 32,153,661