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Share-Based Compensation - Additional Information (Detail) (USD $)
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Equity Option [Member]
Jun. 30, 2014
Long Term Incentive Stock Option [Member]
Jun. 30, 2014
Long Term Incentive Stock Option [Member]
Maximum [Member]
Jun. 30, 2014
Long Term Incentive Stock Option [Member]
Minimum [Member]
Jun. 30, 2014
Long Term Incentive Plan Stock Option [Member]
Jun. 30, 2014
Long Term Incentive Plan Stock Option [Member]
Jun. 30, 2013
Long Term Incentive Plan Stock Option [Member]
Jun. 30, 2013
Long Term Incentive Plan Stock Option [Member]
Maximum [Member]
Jun. 30, 2014
Long Term Incentive Plan Stock Option [Member]
Maximum [Member]
Jun. 30, 2013
Long Term Incentive Plan Stock Option [Member]
Maximum [Member]
Jun. 30, 2014
Long Term Incentive Plan [Member]
Jun. 30, 2014
Deferred Compensation Plan [Member]
Deferrals_
Jun. 30, 2014
Performance-Based RSUs [Member]
Jun. 30, 2013
Performance-Based RSUs [Member]
Jun. 30, 2014
Performance-Based RSUs [Member]
Jun. 30, 2013
Performance-Based RSUs [Member]
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Jun. 30, 2013
Restricted Stock Units (RSUs) [Member]
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Chief Executive Officer [Member]
Jun. 30, 2014
Stock Options [Member]
Jun. 30, 2013
Stock Options [Member]
Jun. 30, 2014
Stock Options [Member]
Maximum [Member]
Jun. 30, 2014
Time-Based RSUs [Member]
Jun. 30, 2014
Time-Based RSUs [Member]
Jun. 30, 2013
Time-Based RSUs [Member]
Maximum [Member]
Jun. 30, 2013
Time-Based RSUs [Member]
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                        
Exercised, Number of Shares               1,250 9,250                         900 10,900          
Total intrinsic value of stock options                 $ 300,000   $ 100,000                       $ 300,000 $ 100,000        
Cash received for the exercise of stock options awards                 400,000   100,000                       500,000 100,000        
Excess tax benefits                                           0 100,000          
Compensation expenses             100,000 200,000   100,000   100,000                   0 0   100,000 200,000 100,000 100,000
Common shares reserved for awards     100,000 100,000                 900,000           800,000                  
LTIP expiry date                         Apr. 17, 2018                              
Share based compensation arrangement share based payment award vesting period                                         3 years              
Compensation cost expected to be recognized over period                             3,500,000   3,500,000               500,000 500,000    
Weighted-average period               2 years 2 months 12 days                 2 years                 1 year 10 months 24 days    
Performance-based compensation expense                             100,000 800,000 400,000 1,300,000                    
Reduction in 2013 performance-based compensation expense                             (900,000)                          
Excess tax benefits from restricted share awards                                     200,000 0                
Shares remaining to be issued       40,000                             384,398                  
Number of deferrals                           2                            
Deferred shares and held by the rabbi trust 249,557 253,156                                                    
Option issued under plan vest               50.00%                                        
Option issued under plan vest and granted after 2 years               75.00%                                        
Option issued under plan vest and granted after 3 years               100.00%                                        
Option issued under plan vest and expire         10 years 5 years                                            
Estimated Forfeitures               0                                        
Granted, Number of Shares               17,000 0                                      
Weighted average fair value of stock options granted               $ 25.79                                        
Expected compensation cost related to unvested awards not yet recognized             $ 400,000 $ 400,000