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Equity Compensation Plans - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense $ 0.5 $ 0.2 $ 1.2 $ 1.0
Cash received from exercise of stock option 0.3 0.1 1.2 0.3
Number of options exercised, intrinsic value 0.2 0.1 0.7 0.2
Tax Benefit From Stock Options     0.2  
Number of options granted 0 20,000 12,500 20,000
Stock Option Plan 2012
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share options and restricted shares authorized 1,750,000   1,750,000  
Additional shares authorized under the plan     1,200,000  
Time Based Restricted Stock Awards
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares Vested 3,750   3,750  
Performance Based Restricted Stock Awards
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares granted     84,790  
Restricted shares Vested     61,800  
Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost 1.5   1.5  
Weighted average expected amortization period     2 years 2 months 12 days  
Unvested restricted stock awards 313,985   313,985  
Time Based Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares granted     5,000  
Employee Stock Option [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost $ 1.2   $ 1.2  
Weighted average expected amortization period     2 years 8 months 12 days  
Exercised 30,074   128,060