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Share Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares withheld to meet employees' statutory income tax obligation 425,000 365,000
Amounts paid to taxing authorities for employees’ tax obligations $ 1,366 $ 1,077
Employees Tax Obligations [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Amounts paid to taxing authorities for employees’ tax obligations $ 1,366 $ 1,077
Performance Stock Units [Member] | Long Term Incentive Program [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Performance Stock Units [Member] | Long Term Incentive Program [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation award percentage 0.00%  
Performance Stock Units [Member] | Long Term Incentive Program [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation award percentage 150.00%