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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of TDR Finance Receivables that Subsequently Defaulted (Detail) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021 USD ($) Loan	Jun. 30, 2020 USD ($) Loan	Jun. 30, 2021 USD ($) Loan	Jun. 30, 2020 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan		252	628	680	1,886
TDR Net Finance Receivables | $	[1]	$ 847	$ 1,951	$ 2,111	$ 5,613
Small Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan		140	365	406	1,164
TDR Net Finance Receivables | $	[1]	$ 267	$ 638	$ 724	$ 2,056
Large Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan		111	256	270	694
TDR Net Finance Receivables | $	[1]	$ 579	$ 1,301	$ 1,372	$ 3,506
Automobile Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan				1
TDR Net Finance Receivables | $	[1]			$ 10
Retail Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loan		1	7	3	28
TDR Net Finance Receivables | $	[1]	$ 1	$ 12	$ 5	$ 51
[1] (1) Only includes defaults occurring within 12 months of a loan being designated as a TDR. Represents the corresponding balance of TDR net finance receivables at the end of the month in which they defaulted.

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- Definition

Represents the balance of TDR net finance receivables at the end of the month in which they defaulted (such defaults occurring within 12 months of a loan being designated as a TDR).

+ References

No definition available.

+ Details

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Namespace Prefix:	rm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the number of TDR net finance receivables that defaulted within 12 months of a loan being designated as a TDR.

+ References

No definition available.

+ Details

Name:	rm_TDRNumberOfDefaultedLoans
Namespace Prefix:	rm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
Data Type:	na
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- Details

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Data Type:	na
Balance Type:
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