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Stock-based Compensation Plans - Restricted Stock and Restricted Stock Units Outstanding (Detail) - $ / shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 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 (811,670)  
Forfeited (86,865)  
Outstanding, Ending Balance 5,566,415  
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 8.95  
Forfeited, weighted average grant date fair value 11.75  
Outstanding, Ending Balance, weighted average grant date fair value $ 5.69  
Restricted Stock Liability Awards    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding, Beginning Balance 411,126  
Granted 3,301,344  
Vested (529,484)  
Forfeited 0  
Outstanding, Ending Balance 3,182,986  
Outstanding, Beginning Balance, weighted average grant date fair value $ 10.94  
Granted, weighted average grant date fair value 3.02  
Vested, weighted average grant date fair value 5.17  
Forfeited, weighted average grant date fair value 0  
Outstanding, Ending Balance, weighted average grant date fair value $ 3.69