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Share-Based Compensation - Narrative (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Share-based compensation   $ 1.8 $ 3.3 $ 3.2 $ 6.7
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 $ 1.61        
Graded vesting period 3 years        
Dividend payable $ 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 $ 1.61        
Cliff vesting period 34 months        
Phantom restricted stock units          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Annual share-based compensation grants 1.5        
Grant date share price $ 1.88        
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 1.5        
Cliff vesting period 34 months        
Grant date share price $ 1.88        
Phantom stock units          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Dividend payable $ 0.0