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Share-Based Compensation Plans - Additional Information (Detail) - $ / shares
3 Months Ended 6 Months Ended
Jun. 11, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Time Based Option Award          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options awarded   0 0 200,000 25,000
Strike price per share       $ 28.37 $ 24.00
Percentage of shares vested on each anniversary of the grant date       33.33%  
Unvested stock options forfeited   0 0    
Time-based options vesting date       2017-02 2017-02
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares issued   0      
Restricted Stock | Key Employee | Time Based Vesting          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares issued       83,875 78,166
Restricted Stock | Key Employee | Stock vest first anniversary of the grant          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of shares vested on each anniversary of the grant date       16.50%  
Vesting period       1 year  
Restricted Stock | Key Employee | Stock vest second anniversary of the grant          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of shares vested on each anniversary of the grant date       16.50%  
Vesting period       2 years  
Restricted Stock | Key Employee | Stock vest third anniversary of the grant          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of shares vested on each anniversary of the grant date       17.00%  
Vesting period       3 years  
Restricted Stock | Key Employee | Vesting Schedule Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of shares vested on each anniversary of the grant date       100.00% 100.00%
Vesting period       3 years 3 years
Percentage of stock award subject to vesting       50.00% 50.00%
Restricted Stock | Chief Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of shares vested on each anniversary of the grant date       33.33% 33.33%
Number of shares issued       10,574 11,587
Vesting period       3 years 3 years
Restricted Stock | Chief Executive Officer And Other Key Employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of shares vested on each anniversary of the grant date       100.00%  
Number of shares issued       44,058  
Vesting date       Jan. 18, 2018  
Ordinary Shares A | Share Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized to be issued 2,000,000        
Ordinary Shares A | Key Employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares issued 90,023   5,671 138,507 95,694
Weighted average grant date value of shares granted     $ 26.45 $ 28.37 $ 25.37
Ordinary Shares A | Key Employee | First Vesting          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of shares vested on each anniversary of the grant date         33.33%
Number of shares issued         5,671
Vesting period         3 years
Ordinary Shares A | Non Employee Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average grant date value of shares granted   $ 28.08 $ 25.99 $ 27.91 $ 26.16
Number of shares earned not granted until 2nd quarter, 2014   8,798 9,250 18,045 18,178
Ordinary Shares A | Non Employee Director | Revised Compensation Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares issued 27,766