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Finance Receivables, Allowance for Credit Losses and Credit Quality Information - Finance Receivables Associated with Customers in Bankruptcy (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Finance receivables in bankruptcy | $ 5,584 | $ 5,258
Small Installment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Finance receivables in bankruptcy | 690 | 420
Large Installment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Finance receivables in bankruptcy | 1,601 | 1,696
Automobile Purchase [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Finance receivables in bankruptcy | 3,199 | 3,071
Retail Purchase Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Finance receivables in bankruptcy | $ 94 | $ 71

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- Definition Financing receivables related with customers in bankruptcy. + References No definition available. + Details
Name: | rm_FinancingReceivablesRelatedWithCustomersInBankruptcy
Namespace Prefix: | rm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration