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Share-Based Compensation - Additional Information (Detail)
1 Months Ended 12 Months Ended
Nov. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Deferrals
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Forfeiture of restricted stock based unit | shares   47,832    
Deferred shares and held by the rabbi trust | shares   296,635 292,609  
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercised, Number of Shares | shares   0 1,000 19,150
Total intrinsic value of stock options   $ 0   $ 600,000
Cash received for the exercise of stock options awards   0    
Compensation expenses   0 $ 0 0
Excess tax benefits   $ 0 0 200,000
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares reserved for awards | shares   800,000    
Shares remaining to be issued | shares   312,398    
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer And Other Officers [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses $ 600,000      
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares reserved for awards | shares   800,000    
Time-Based RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses   $ 300,000 300,000 300,000
Compensation cost expected to be recognized over period   $ 300,000    
Weighted-average period   1 year 7 months 6 days    
Performance-Based RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost expected to be recognized over period   $ 500,000    
Weighted-average period   2 years    
Performance-based compensation expense (income)   $ 1,000,000 $ 1,000,000 2,700,000
Forfeiture of restricted stock based unit | shares   47,832 3,537  
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
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] | 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    
Grant 2012 [Member] | Performance-Based RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance-based compensation expense (income)     200,000  
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 $ 1,300,000  
Grant 2014 [Member] | Performance-Based RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance-based compensation expense (income)   $ 800,000    
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 1,250 14,250
Cash received for the exercise of stock options awards   $ 0 $ 100,000  
Compensation expenses   300,000 300,000 $ 100,000
Excess tax benefits   $ 0 $ 100,000 $ 100,000
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   10,500 35,500 0
Weighted average grant date fair value options granted | $ / shares   $ 13.16 $ 20.83  
Expected compensation cost related to unvested awards not yet recognized   $ 400,000    
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  
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