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Equity-based Awards - Summary of Information Regarding Restricted Stock Unit Awards (Parenthetical) (Detail) - USD ($)
$ / shares in Units, $ in Millions
5 Months Ended 7 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2019
Aug. 05, 2019
Dec. 31, 2017
Dec. 31, 2018
Aug. 06, 2019
May 04, 2017
TSUs [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Aggregate grant date fair value of restricted stock units issued $ 0.1 $ 2.0 $ 2.2 $ 4.6    
Grant Date Market Price $ 6.14          
Unvested awards converted into newly issued TSUs         $ 5.12  
TSUs [Member] | Departing Executives [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Forfeited, Number of Units       298,354    
TSUs [Member] | Minimum [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Grant Date Market Price   $ 4.48 $ 10.00 $ 9.30    
TSUs [Member] | Maximum [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Grant Date Market Price   8.70 $ 13.77 $ 11.00    
PSUs [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Aggregate grant date fair value of restricted stock units issued       $ 3.2    
PSUs [Member] | Minimum [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Calculated fair value price $ 2.38 $ 1.64   $ 5.88 1.64  
PSUs [Member] | Maximum [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Aggregate grant date fair value of restricted stock units issued $ 0.1 $ 0.1        
Calculated fair value price $ 3.40 $ 6.76   $ 9.87 2.63  
Restricted Stock Units (RSUs) | 2017 Non-Employee Directors Compensation Plan [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Aggregate grant date fair value of restricted stock units issued   $ 0.3 $ 0.2 $ 0.3    
Grant Date Market Price   $ 6.95 $ 13.77 $ 10.45    
Forfeited, Number of Units 0 0 0 0    
Unvested awards converted into newly issued TSUs [1] $ 5.12 $ 8.35 $ 13.77 $ 11.36 $ 5.12 [2] $ 0
[1] Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.
[2] This reflects the unvested Board RSU awards converted into newly issued Board RSUs at August 6, 2019 in which the stock price was at $5.12 per share