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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
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