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Share-Based Compensation - Additional Information (Detail)
3 Months Ended 9 Months Ended
May 10, 2016
shares
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Deferrals
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted shares granted under incentive plan | shares       89,142    
Weighted average grant date fair value options granted | $ / shares         $ 11.78  
Deferred shares and held by the rabbi trust | shares   297,281   297,281   296,635
Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercised, Number of Shares | shares       6,450 0  
Cash received for the exercise of stock options awards       $ 200,000    
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   800,000    
Performance 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 9 months 18 days    
Performance-Based RSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted-average period       2 years 1 month 6 days    
Performance-based compensation expense (income)   300,000 (1,000,000) $ 600,000 (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    
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]            
Increase (Reduction) in performance-based compensation expense   100,000   (200,000)    
Grant 2013 [Member] | Performance-Based RSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Increase (Reduction) in performance-based compensation expense     (800,000)   (800,000)  
Grant 2014 [Member] | Performance-Based RSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Increase (Reduction) in performance-based compensation expense     (600,000)   $ (1,200,000)  
Remaining performance-based compensation expense   $ 2,000,000   $ 2,000,000    
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    
2016 Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common shares reserved for awards | shares 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 | shares 100,000          
Granted, Number of Shares | 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 | shares 900,000          
Restricted shares granted under incentive plan | shares       0    
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    
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       1,000 0  
Cash received for the exercise of stock options awards       $ 100,000    
Compensation expenses       $ 100,000    
Granted, Number of Shares | shares       0 2,000  
Weighted-average period       1 year 4 months 24 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]            
Total intrinsic value of stock options       $ 100,000    
Compensation expenses   $ 100,000 $ 100,000   $ 200,000  
Deferred Compensation Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of deferrals | Deferrals       2