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

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- 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

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- 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
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
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: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rm_LargeLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_AutomobileLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rm_RetailLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |