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Share-Based Compensation - Narrative (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share and cash based compensation   $ 6.8 $ 0.3
Restricted stock units      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Annual share-based compensation grants 0.8    
Grant date fair value $ 4.52    
Graded vesting period 3 years    
Dividend payable $ 0.0 $ 0.0  
Performance share units      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Annual share-based compensation grants 0.8    
Grant date fair value $ 4.52    
Cliff vesting period 3 years    
Phantom restricted stock units      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Annual share-based compensation grants 0.9    
Grant date share price $ 4.52 $ 4.52  
Payment description   payable in three equal installments over a period of three years after the grant date  
Payment term 3 years    
Phantom performance stock units      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Annual share-based compensation grants 0.9    
Cliff vesting period 3 years    
Grant date share price $ 4.52 $ 4.52  
Phantom stock units      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Dividend payable $ 0.0 $ 0.0