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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 01, 2020
Sep. 30, 2020
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Significant Accounting Policies [Line Items]          
Contractual delinquent period of loans     180 days    
Bankruptcy delinquency threshold     60 days    
Delinquency interest accrual cessation     90 days    
Threshold period to write off financing receivable   90 days 90 days    
Increase decrease in allowance for credit losses   $ 2.0      
Retrospective decrease to retained earnings $ 45.9        
Cumulative reduction to retained earnings, net of tax 14.2        
Percentage of finance receivables, allowance for credit losses   13.60% 13.60% 13.90% 5.70%
Modified retrospective Approach [Member]          
Significant Accounting Policies [Line Items]          
Increase decrease in allowance for credit losses $ 60.1        
Pre-CECL [Member]          
Significant Accounting Policies [Line Items]          
Percentage of finance receivables, allowance for credit losses 5.50%        
Post-CECL [Member]          
Significant Accounting Policies [Line Items]          
Percentage of finance receivables, allowance for credit losses 10.80%