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Share Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2013
Sep. 30, 2016
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares)     75,640
Restricted Stock | Employees and Non-employee Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period     3 years
Cash-settled Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period     3 years
Granted (in shares)     39,450
Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost     $ 11.9
Weighted-average period of total unrecognized compensation cost, in years     1 year 6 months
Unvested Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost     $ 10.0
Weighted-average period of total unrecognized compensation cost, in years     1 year 1 month 6 days
Performance Shares Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period     3 years
Granted (in shares)   43,800 85,130
Payout percent 200.00%    
Stock issued during period (in shares) 87,600    
Total unrecognized compensation cost     $ 7.6
Weighted-average period of total unrecognized compensation cost, in years     1 year 1 month 6 days