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Fair Value Measurements - Financial Assets and Liabilities Not Measured at Fair Value (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Sep. 19, 2018
Sep. 01, 2017
May 30, 2014
Variable Interest Entity, Primary Beneficiary            
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]            
Installment loans and RPAs, net $ 280.7 $ 278.3 $ 319.0      
Restricted cash $ 23.2 $ 26.7 $ 22.2      
8.50% Senior Notes Due 2024            
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]            
Debt instrument, interest rate 8.50% 8.50%     8.50%  
Debt instrument, maturity date Sep. 01, 2024 Sep. 01, 2024        
8.50% Senior Notes Due 2025            
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]            
Debt instrument, interest rate 8.50%     8.50%    
Debt instrument, maturity date Sep. 15, 2025          
9.75% Senior Notes Due 2021            
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]            
Debt instrument, interest rate 9.75% 9.75%       9.75%
Debt instrument, maturity date Jun. 01, 2021 Jun. 01, 2021