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Share-Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Long Term Incentive Stock Option [Member]
Mar. 31, 2014
Long Term Incentive Stock Option [Member]
Maximum [Member]
Mar. 31, 2014
Long Term Incentive Stock Option [Member]
Minimum [Member]
Mar. 31, 2014
Long Term Incentive Plan Stock Option [Member]
Mar. 31, 2013
Long Term Incentive Plan Stock Option [Member]
Mar. 31, 2014
Long Term Incentive Plan Stock Option [Member]
Maximum [Member]
Mar. 31, 2013
Long Term Incentive Plan Stock Option [Member]
Maximum [Member]
Mar. 31, 2014
Long Term Incentive Plan [Member]
Mar. 31, 2014
Performance-Based RSUs [Member]
Mar. 31, 2013
Performance-Based RSUs [Member]
Mar. 31, 2014
Deferred Compensation Plan [Member]
Deferrals
Mar. 31, 2014
Stock Options [Member]
Mar. 31, 2013
Stock Options [Member]
Mar. 31, 2014
Restricted Stock Units (RSUs) [Member]
Mar. 31, 2013
Restricted Stock Units (RSUs) [Member]
Mar. 31, 2014
Restricted Stock Units (RSUs) [Member]
Chief Executive Officer [Member]
Mar. 31, 2014
Time-Based RSUs [Member]
Mar. 31, 2013
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Exercised, Number of Shares 0         1,250 0             0 0          
Compensation expenses           $ 100,000     $ 100,000         $ 0 $ 0       $ 100,000 $ 100,000
Common shares reserved for awards     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                     5,300,000               600,000  
Weighted-average period           2 years 4 months 24 days         2 years 1 month 6 days               2 years 1 month 6 days  
Performance-based compensation expense                     600,000 500,000                
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 249,198 253,156                                    
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 0         17,000 0                          
Weighted average fair value of stock options granted           $ 25.79                            
Total intrinsic value of stock options             0 100,000 0                      
Cash received for the exercise of stock options awards           100,000 0                          
Expected compensation cost related to unvested awards not yet recognized           $ 500,000