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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Additional Information (Detail)	3 Months Ended			6 Months Ended
	Sep. 30, 2021	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Rating	Jun. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net finance receivables included net deferred origination fees		$ 12,800,000		$ 12,800,000			$ 12,600,000
Number of FICO band categories | Rating				6
Accrued interest		4,800	$ 6,200	$ 4,800	$ 6,200
Allowance for credit losses		$ 139,400,000	$ 142,000,000	$ 139,400,000	$ 142,000,000	$ 139,600,000	$ 150,000,000	$ 142,400,000		$ 62,200,000
Allowance as Percentage of Finance Receivables		11.80%	13.90%	11.80%	13.90%
C A R E S Act | Forecast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in U.S. unemployment rate	8.00%
Net Build Related to Portfolio Growth [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase decrease in allowance for credit losses		$ 6,100,000		$ 2,300,000
Reserve Release Due to Portfolio Liquidation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase decrease in allowance for credit losses			$ 9,900,000		$ 13,700,000
COVID19 Impact [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
COVID-19 reserves included in the allowance for credit losses				$ 17,500,000
CECL Allowance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses									$ 122,300,000
Allowance percentage of net finance receivables									10.80%
Quarterly Trend - Amortized Cost Basis [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses										$ 62,200,000
Allowance as Percentage of Finance Receivables										5.50%

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The allowance for credit losses as a percentage of total finance receivables.

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The allowance for credit losses as a percentage of net finance receivables.

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The aggregate amount of COVID-19 reserves still included in the allowance for credit losses as of the period end.

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The number of FICO band categories the Company uses to assess FICO scores.

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The increase in the national unemployment rate within the United States.

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Amount of increase (decrease) of allowance reserve for credit loss.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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