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Stock-based Compensation Plans - Restricted Stock and Restricted Stock Units Outstanding (Detail) - $ / shares
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Restricted Stock Equity Awards    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding, Beginning Balance 2,002,239  
Granted 4,462,711 2,800,000
Vested (1,788,235)  
Forfeited (431,201)  
Outstanding, Ending Balance 4,245,514  
Outstanding, Beginning Balance, weighted average grant date fair value $ 12.32  
Granted, weighted average grant date fair value 3.42 $ 10.59
Vested, weighted average grant date fair value 7.08  
Forfeited, weighted average grant date fair value 8.47  
Outstanding, Ending Balance, weighted average grant date fair value $ 5.56  
Restricted Stock Liability Awards    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding, Beginning Balance 411,126  
Granted 3,529,686  
Vested (2,003,051)  
Forfeited (81,570)  
Outstanding, Ending Balance 1,856,191  
Outstanding, Beginning Balance, weighted average grant date fair value $ 10.94  
Granted, weighted average grant date fair value 3.18  
Vested, weighted average grant date fair value 4.03  
Forfeited, weighted average grant date fair value 3.02  
Outstanding, Ending Balance, weighted average grant date fair value $ 3.98