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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	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables in bankruptcy	$ 5,990	$ 6,203
Branch Small [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables in bankruptcy	530	582
Convenience Checks [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables in bankruptcy	492	544
Large [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables in bankruptcy	1,290	1,260
Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables in bankruptcy	3,548	3,698
Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables in bankruptcy	$ 130	$ 119

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- Definition

Balance of finance receivable held by the company with customers that are involved in bankruptcy proceedings.

+ 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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- 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:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: