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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary Of Impact Of Allowance For Credit Losses During The period (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 01, 2020
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]                      
Beginning balance $ 62,200 $ 144,000 $ 142,000 $ 142,400 $ 62,200 $ 62,200          
Impact of CECL adoption           60,100          
COVID reserve build / (release)   (1,500) (1,500) 9,500   30,400          
Other   7,500 3,500 (9,900)   (2,700)          
Ending balance   $ 150,000 $ 144,000 $ 142,000 142,400 $ 150,000          
Percentage of finance receivables, allowance for credit losses   13.20% 13.60% 13.90%   13.20% 5.50%       6.10%
Quarterly Trend - Amortized Cost Basis [Member]                      
Accounts Notes And Loans Receivable [Line Items]                      
Beginning balance 62,200       62,200 $ 62,200          
Impact of CECL adoption 60,100                    
Ending balance $ 122,300                    
Percentage of finance receivables, allowance for credit losses 10.80%           5.50% 5.70% 5.70% 6.10%  
Restatement Adjustment Member                      
Accounts Notes And Loans Receivable [Line Items]                      
Beginning balance $ 122,300     $ 142,400 122,300 $ 122,300          
COVID reserve build / (release)         23,900            
Other         (3,800)            
Ending balance $ 122,300       $ 142,400            
Percentage of finance receivables, allowance for credit losses         12.90%