XML 84 R69.htm IDEA: XBRL DOCUMENT v3.22.0.1
Share-Based Compensation - Additional Information (Detail)
12 Months Ended
Dec. 31, 2021
USD ($)
Deferral
$ / shares
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
May 10, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares granted under incentive plan 63,593      
Forfeiture of restricted stock based unit 6,431      
Deferred shares and held by the rabbi trust 243,138 265,508    
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares reserved for awards 800,000      
Long Term Incentive Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares reserved for awards 100,000      
Granted, Number of Shares 3,000      
Time-Based RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses | $ $ 500,000 $ 400,000 $ 500,000  
Compensation cost expected to be recognized over period | $ $ 700,000      
Weighted-average period 1 year 9 months 18 days      
Time-Based RSUs [Member] | Former Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Forfeiture of restricted stock based unit 1,286      
Performance-Based RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average period 1 year 8 months 12 days      
Performance-based compensation expense (income) | $ $ 3,400,000 3,500,000 3,900,000  
Remaining compensation expense | $ $ 3,700,000      
Performance-Based RSUs [Member] | Former Officer [Member] | Grant 2020, 2019 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Forfeiture of restricted stock based unit 5,145      
Service and Performance-based RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Excess tax benefits from restricted share awards | $ $ 200,000 $ 400,000 $ 500,000  
Long Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares reserved for awards 900,000      
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] | 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 380,278      
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 43,500      
Deferred Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of deferrals | Deferral 2      
Long Term Incentive Plan and 2016 Incentive Plan [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 and 2016 Incentive Plan [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 Plan and 2016 Incentive Plan [Member] | After One Year [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option awards vesting percentage 50.00%      
Long Term Incentive Plan and 2016 Incentive Plan [Member] | After Two Years [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option awards vesting percentage 75.00%      
Long Term Incentive Plan and 2016 Incentive Plan [Member] | After Three Years [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option awards vesting percentage 100.00%      
Long Term Incentive Plan Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, Number of Shares 3,000 25,500 5,000  
Compensation expenses | $ $ 200,000 $ 100,000    
Weighted-average period 1 year 7 months 6 days      
Estimated Forfeitures | $ $ 0      
Weighted average grant date fair value options granted | $ / shares $ 69.89      
Exercised, Number of Shares 7,000 5,050 4,000  
Total intrinsic value of stock options | $ $ 200,000 $ 100,000    
Cash received for the exercise of stock options | $ 300,000 200,000    
Expected compensation cost related to unvested awards not yet recognized | $ 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  
Total intrinsic value of stock options | $     100,000  
Excess tax benefits | $ $ 100,000 $ 100,000 $ 100,000