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Share-Based Compensation - Additional Information (Detail)
3 Months Ended
Mar. 31, 2016
USD ($)
Deferrals
shares
Mar. 31, 2015
USD ($)
shares
Dec. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred shares and held by the rabbi trust | shares 296,326   296,635
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercised, Number of Shares | shares 0 0  
Compensation expenses $ 0 $ 0  
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for awards | shares 800,000    
Shares remaining to be issued | shares 223,256    
Time-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expenses $ 100,000 100,000  
Compensation cost expected to be recognized over period $ 600,000    
Weighted-average period 2 years 2 months 12 days    
Performance-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average period 2 years 6 months    
Performance-based compensation expense (income) $ 300,000 400,000  
Maximum [Member] | Service and Performance-based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Excess tax benefits from restricted share awards 100,000 100,000  
Grant 2014 [Member] | Performance-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Reduction in performance-based compensation expense   $ (400,000)  
Remaining performance-based compensation expense $ 3,200,000    
Long Term Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for awards | shares 900,000    
LTIP expiry date Apr. 17, 2018    
Deferred Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of deferrals | Deferrals 2    
Long Term Incentive Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for awards | shares 100,000    
Shares remaining to be issued | shares 11,000    
Long Term Incentive Stock Option [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option issued under plan vest and expire 10 years    
Long Term Incentive Stock Option [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option issued under plan vest and expire 5 years    
Long Term Incentive Plan Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercised, Number of Shares | shares 0    
Weighted-average period 1 year 9 months 18 days    
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%    
Estimated Forfeitures $ 0    
Granted, Number of Shares | shares 0 0  
Expected compensation cost related to unvested awards not yet recognized $ 300,000    
Long Term Incentive Plan Stock Option [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expenses $ 100,000 $ 100,000