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Equity Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2020
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense     $ 8,060 $ 0
PSU        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense   $ 2,900 8,100  
Unrecognized expense   $ 27,400 $ 27,400  
Weighted average remaining period     2 years 3 months  
PSU | Scenario, Forecast        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Consecutive trading days 30 days      
PSU | Scenario, Forecast | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awarded PSUs recipient vesting 0.00%      
PSU | Scenario, Forecast | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awarded PSUs recipient vesting 200.00%