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Shareholders' Equity - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 13, 2020
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock repurchase program, authorized amount $ 30,000,000.0      
Stock repurchase program, termination date Mar. 12, 2021      
Share repurchased, shares   438,142    
Share repurchased, fair value   $ 9,876,000    
Share repurchased, average price per share   $ 22.52    
RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted share units issued   111,510 86,220  
Weighted average grant date fair value, restricted share unit   $ 22.96 $ 27.39  
Performance-based RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted share units issued   14,000   70,000
Weighted average grant date fair value, restricted share unit   $ 22.96    
Restricted share units vesting period       5 years
Restricted share units, incremental performance percentage, year 2018       10.00%
Restricted share units, incremental performance percentage, year 2019       15.00%
Restricted share units, incremental performance percentage, year 2020       20.00%
Restricted share units, incremental performance percentage, year 2021       25.00%
Restricted share units, incremental performance percentage, year 2022       30.00%
Performance-based RSUs [Member] | 2020 Performance [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted share units issued       14,000
Performance-based RSUs [Member] | Performance Criteria Not Yet Determined [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted share units issued       38,500
Performance-based RSUs [Member] | 2018 and 2019 Performance [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted share units issued   17,500,000