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Share-Based Compensation Plans - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Ordinary Shares A | A Former Employee
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Strike price of options exercised $ 20.00   $ 20.00  
Non Employee Director | Ordinary Shares A
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fully vested shares granted with restrictions 9,718 11,487 31,583 39,622
Weighted average grant date value of fully vested shares granted with restrictions $ 23.55 $ 20.25 $ 22.90 $ 19.83
Number of shares issued 9,326      
Weighted average grant date value of shares earned not granted $ 25.46      
Key Employees
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued     81,587  
Key Employees | Ordinary Shares A
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued       29,675
Weighted average grant date value of shares granted       $ 18.60
Key Employees | Ordinary Shares A | A Former Employee
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued 7,717   95,879  
Weighted average grant date value of shares granted     $ 21.81  
Number of shares issued due to exercising of granted options     14,292