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Share-Based Compensation - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Deferrals
$ / shares
shares
Sep. 30, 2014
USD ($)
$ / shares
shares
Dec. 31, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Excess tax benefits from restricted share awards     $ 20,000 $ 160,000  
Deferred shares and held by the rabbi trust | shares 291,021   291,021   292,609
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercised, Number of Shares | shares     0 1,000  
Total intrinsic value of stock options     $ 0    
Cash received for the exercise of stock options awards     0    
Compensation expenses     $ 0 $ 0  
Common shares reserved for awards | shares 100,000   100,000    
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common shares reserved for awards | shares 800,000   800,000    
Shares remaining to be issued | shares 327,398   327,398    
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation arrangement share based payment award vesting period     3 years    
Time-Based RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expenses $ 100,000 $ 100,000 $ 200,000 200,000  
Compensation cost expected to be recognized over period 400,000   $ 400,000    
Weighted-average period     1 year 8 months 12 days    
Performance-Based RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost expected to be recognized over period 1,900,000   $ 1,900,000    
Weighted-average period     2 years 3 months    
Performance-based compensation expense (income) (1,000,000)   $ (800,000)    
Maximum [Member] | Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total intrinsic value of stock options       100,000  
Cash received for the exercise of stock options awards       100,000  
Maximum [Member] | Performance-Based Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Excess tax benefits from restricted share awards     100,000 200,000  
Maximum [Member] | Performance-Based RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance-based compensation expense (income)   (100,000)   400,000  
Grant 2013 [Member] | Performance-Based RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance-based compensation expense (income) (800,000) (200,000) (800,000) (1,100,000)  
Grant 2014 [Member] | Performance-Based RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance-based compensation expense (income) $ (600,000)   $ (1,200,000)    
Grant 2012 [Member] | Performance-Based RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance-based compensation expense (income)   (400,000)   $ (400,000)  
Long Term Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common shares reserved for awards | shares 900,000   900,000    
LTIP expiry date     Apr. 17, 2018    
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   100,000    
Shares remaining to be issued | shares 19,500   19,500    
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 1,250  
Cash received for the exercise of stock options awards     $ 0 $ 100,000  
Compensation expenses $ 100,000 $ 100,000 $ 200,000 $ 200,000  
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     2,000 22,000  
Weighted average grant date fair value options granted | $ / shares     $ 11.78 $ 20.83  
Expected compensation cost related to unvested awards not yet recognized $ 300,000   $ 300,000    
Long Term Incentive Plan Stock Option [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total intrinsic value of stock options     $ 0 $ 100,000  
Deferred Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of deferrals | Deferrals     2