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Share-Based Compensation - Additional Information (Detail)
3 Months Ended 6 Months Ended
May 10, 2016
shares
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Deferrals
shares
Jun. 30, 2015
USD ($)
shares
Dec. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted shares granted under incentive plan       89,142    
Deferred shares and held by the rabbi trust   296,817   296,817   296,635
Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercised, Number of Shares       0 0  
Compensation expenses | $       $ 0 $ 0  
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       2 years    
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common shares reserved for awards   800,000   800,000    
Performance period       3 years    
Performance-Based RSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted-average period       2 years 4 months 24 days    
Performance-based compensation expense (income) | $   $ 100,000 (200,000) $ 300,000 200,000  
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 2015 [Member] | Performance-Based RSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Reduction in performance-based compensation expense | $   (300,000)   (300,000)    
Grant 2013 [Member] | Performance-Based RSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Reduction in performance-based compensation expense | $     (500,000)   (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)   $ (600,000)  
Remaining performance-based compensation expense | $   2,600,000   $ 2,600,000    
Long Term Incentive Plan Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercised, Number of Shares       0    
Granted, Number of Shares       0 0  
Weighted-average period       1 year 7 months 6 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    
Expected compensation cost related to unvested awards not yet recognized | $   200,000   200,000    
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 $ 100,000 $ 100,000  
Deferred Compensation Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of deferrals | Deferrals       2    
Long Term Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common shares reserved for awards   900,000   900,000    
Long Term Incentive Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common shares reserved for awards   100,000   100,000    
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    
2016 Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common shares reserved for awards 1,000,000          
Incentive plan expiry date May 10, 2026          
2016 Incentive Plan [Member] | Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common shares reserved for awards 100,000          
Granted, Number of Shares       0    
2016 Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common shares reserved for awards 900,000          
Restricted shares granted under incentive plan       0