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Stock-based Compensation Plans - Additional Information 2 (Detail) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Restricted Stock Equity Awards    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Granted 2,792,438 1,800,000
Granted, weighted average grant date fair value $ 10.59 $ 17.00
Vesting period 3 years  
Stock-based compensation expense $ 13.6 $ 12.4
Restricted Stock Liability Awards    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Granted 1,171,513  
Granted, weighted average grant date fair value $ 10.32  
Stock-based compensation expense $ 4.6 $ 10.5
Restricted Stock Liability Awards | Employees    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Granted 1,000,000.0 675,000
Granted, weighted average grant date fair value $ 10.45 $ 15.22
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 157,000 131,000
Granted, weighted average grant date fair value $ 9.50 $ 15.46