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Share-Based Compensation Plans - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Time Based Option Award
Sep. 30, 2013
Time Based Option Award
Sep. 30, 2014
Time Based Option Award
Sep. 30, 2013
Time Based Option Award
Sep. 30, 2014
Restricted Stock
Key Employees
Vesting Schedule One
Sep. 30, 2014
Restricted Stock
Key Employees
Vesting Schedule Two
Sep. 30, 2013
Restricted Stock
key Employees And Former Employee
Vesting Schedule One
Sep. 30, 2013
Restricted Stock
key Employees And Former Employee
Vesting Schedule Two
Jun. 11, 2014
Ordinary Shares A
Share Incentive Plan
Sep. 30, 2013
Ordinary Shares A
A Former Employee
Sep. 30, 2013
Ordinary Shares A
A Former Employee
Sep. 30, 2014
Ordinary Shares A
Key Employees
Sep. 30, 2014
Ordinary Shares A
Key Employees
First Vesting
Sep. 30, 2014
Ordinary Shares A
Key Employees
Second Vesting
Sep. 30, 2014
Ordinary Shares A
Non Employee Director
Sep. 30, 2013
Ordinary Shares A
Non Employee Director
Sep. 30, 2014
Ordinary Shares A
Non Employee Director
Sep. 30, 2013
Ordinary Shares A
Non Employee Director
Sep. 30, 2014
Ordinary Shares A
Non Employee Director
Revised Compensation Plan
Sep. 30, 2013
Ordinary Shares A
key Employees And Former Employee
Sep. 30, 2013
Ordinary Shares A
key Employees And Former Employee
Time Based Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Shares authorized to be issued                 2,000,000                        
Stock options awarded 0 0 25,000 0                                  
Unvested stock options forfeited 75,000 0 75,000 0                                  
Stock option awarded, strike price     $ 24.00             $ 20.00 $ 20.00                    
Time-based options vesting date     2017-02                                    
Number of shares issued                   7,717 14,292 95,694 5,671 90,023 9,498 9,718 27,676 31,583 18,838 95,879 81,587
Weighted average grant date value of shares granted                       $ 25.37     $ 25.23 $ 23.55 $ 25.84 $ 22.90   $ 21.81  
Percentage of shares vested on each anniversary of the grant date           100.00%   100.00%         33.33%                
Vesting period         3 years 3 years 3 years 3 years                          
Number of shares earned not granted                               9,326          
Weighted average grant date value of shares earned not granted                               $ 25.46