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Share-Based Compensation - Additional Information (Detail)
1 Months Ended 12 Months Ended
Nov. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
Deferral
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
May 10, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted shares granted under incentive plan | shares   89,142      
Forfeiture of restricted stock based unit | shares   40,676      
Deferred shares and held by the rabbi trust | shares   297,281 296,635    
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      
Deferred Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of deferrals | Deferral   2      
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      
Long Term Incentive Plan Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercised, Number of Shares | shares   500 0 1,250  
Total intrinsic value of stock options   $ 0 $ 0    
Cash received for the exercise of stock options awards     0    
Compensation expenses   $ 200,000 $ 300,000 $ 300,000  
Granted, Number of Shares | shares   0 10,500 35,500  
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      
Weighted average grant date fair value options granted | $ / shares     $ 13.16    
Expected compensation cost related to unvested awards not yet recognized   100,000      
Excess tax benefits   $ 0 $ 0 $ 100,000  
Maximum [Member] | Long Term Incentive Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Option issued under plan vest and expire   10 years      
Maximum [Member] | Long Term Incentive Plan Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Cash received for the exercise of stock options awards   $ 100,000      
Minimum [Member] | Long Term Incentive Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Option issued under plan vest and expire   5 years      
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercised, Number of Shares | shares   6,450 0 1,000  
Total intrinsic value of stock options     $ 0    
Cash received for the exercise of stock options awards   $ 200,000 0    
Compensation expenses   $ 0 0 $ 0  
Stock Options [Member] | 2016 Incentive Plan [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      
Stock Options [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total intrinsic value of stock options   $ 100,000   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      
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common shares reserved for awards | shares   800,000      
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 Units (RSUs) [Member] | 2016 Incentive Plan [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      
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 8 months 12 days      
Performance-Based RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average period   1 year 10 months 24 days      
Performance-based compensation expense (income)   $ 900,000 $ 1,000,000 1,000,000  
Performance-Based RSUs [Member] | Grant 2014 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Forfeiture of restricted stock based unit | shares   40,676      
Remaining performance-based compensation expense   $ 2,000,000      
Performance-Based RSUs [Member] | Grant 2013 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Forfeiture of restricted stock based unit | shares     47,832    
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  
Service and Performance-based RSUs [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Excess tax benefits from restricted share awards   $ 100,000 $ 100,000