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Stock Options - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of unissued common stock available for grant under the plans (shares) 3,600,000  
Share-based compensation expense $ 5.3 $ 6.2
Proceeds from exercise of stock options $ 0.0 3.7
Performance-Based Unit | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares which will vest after achievement of goals (shares) 0  
Performance-Based Unit | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares which will vest after achievement of goals (shares) 2.0  
Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 4.3 2.9
Total unrecognized compensation cost $ 12.4  
Unrecognized compensation cost, Weighted-average recognition period 2 years 4 months 24 days  
Aggregate weighted-average grant-date fair value of units granted $ 12.5 10.0
Aggregate weighted-average grant-date fair value of units vested 3.4 1.9
Employee Stock Option    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 1.0 3.3
Total intrinsic value of options exercised 0.0 $ 0.6
Total unrecognized compensation cost $ 2.5  
Unrecognized compensation cost, Weighted-average recognition period 1 year 6 months