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Share-Based Compensation - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Deferrals
shares
Jun. 30, 2014
USD ($)
$ / 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 290,470   290,470   292,609
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercised, Number of Shares | shares     0 900  
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 $ 500,000   $ 500,000    
Weighted-average period     1 year 10 months 24 days    
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  
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 21,500   21,500    
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 $ 100,000 $ 200,000  
Weighted-average period     2 years    
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 17,000  
Weighted average grant date fair value options granted | $ / shares       $ 25.79  
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    
Performance-Based RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost expected to be recognized over period 2,900,000   $ 2,900,000    
Weighted-average period     2 years 2 months 12 days    
Performance-based compensation expense (income) (200,000) (100,000) $ 200,000 $ 400,000  
Performance-Based RSUs [Member] | Performance Based RSU Grant 2013 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance-based compensation expense (income) (500,000) $ (900,000) (100,000)    
Performance-Based RSUs [Member] | Performance Based RSU Grant 2014 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance-based compensation expense (income) $ (400,000)   $ (600,000)