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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Net Finance Receivables Modified And Classified As TDRs (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 |  | 1,046 | 1,368 | 2,458 | 4,463
TDR Net Finance Receivables | $ | [1] | $ 3,479 | $ 4,350 | $ 8,069 | $ 13,712
Small Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  | 581 | 888 | 1,368 | 2,689
TDR Net Finance Receivables | $ | [1] | $ 1,085 | $ 2,796 | $ 2,540 | $ 8,171
Large Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  | 462 | 476 | 1,083 | 1,753
TDR Net Finance Receivables | $ | [1] | $ 2,390 | $ 1,542 | $ 5,508 | $ 5,461
Automobile Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  |  |  | 2 | 1
TDR Net Finance Receivables | $ | [1] |  |  | $ 13 | $ 3
Retail Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of Loans | Loan |  | 3 | 4 | 5 | 20
TDR Net Finance Receivables | $ | [1] | $ 4 | $ 12 | $ 8 | $ 77
[1] | (1) Represents the post-modification net finance receivables balance of loans that have been modified during the period and resulted in a TDR.

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- Definition The post-modification net finance receivables balance of loans that have been modified during the period and resulted in a TDR. + References No definition available. + Details
Name: | rm_TDRModifiedLoansBalance
Namespace Prefix: | rm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The number of finance receivables modified as troubled debt restructurings. + References No definition available. + Details
Name: | rm_TDRNumberOfLoansModified
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: |
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Balance Type: |
Period Type: |

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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=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: |