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Stock-Based Compensation - Additional Information (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized stock-based compensation expense | $ $ 37.0
Weighted-average period of recognition of unrecognized stock-based compensation expense (in years) 2 years 2 months 12 days
Employees | Common Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares issued 825,000
Non-employee directors | Common Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares issued 31,000
RSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares granted 1,775,000
Fair value of shares granted | $ $ 35.8
RSUs granted in connection with the 2015 CICP 250,000
Percentage of target incentive compensation eligible to be elected and received by employees in the form of RSUs 50.00%
Restricted stock compensation expense | $ $ 4.3
Total stock-based compensation, period of recognition 1 year
Nonqualified Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Fair value of shares granted | $ $ 16.6
Number of shares granted 2,197,000