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Stock-based Compensation Plans - Additional Information 2 (Detail) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Restricted Stock Equity Awards    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Granted 4,462,711 2,800,000
Granted, weighted average grant date fair value $ 3.42 $ 10.59
Vesting period 3 years  
Stock-based compensation expense $ 13.4 $ 18.9
Restricted Stock Liability Awards    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Granted 3,529,686  
Granted, weighted average grant date fair value $ 3.18  
Stock-based compensation expense $ 7.9 $ 7.0
Restricted Stock Liability Awards | Employees    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Granted 3,300,000 1,000,000.0
Granted, weighted average grant date fair value $ 3.03 $ 10.39
Vesting period 3 years 3 years
Restricted Stock Liability Awards | Non-Employee Directors    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Granted 217,000 183,000
Granted, weighted average grant date fair value $ 5.38 $ 9.11