Finance Receivables, Allowance for Credit Losses, and Credit Quality Information - Summary of Finance Receivables (Detail) (USD $) In Thousands, unless otherwise specified
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Accounts, Notes, Loans and Financing Receivable [Line Items] |
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Finance receivables |
$ 546,192us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome |
$ 544,684us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome |
$ 439,474us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome |
Branch Small [Member] |
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Accounts, Notes, Loans and Financing Receivable [Line Items] |
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Finance receivables |
128,217us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rm_BranchSmallLoansMember |
109,776us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rm_BranchSmallLoansMember |
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Convenience Checks [Member] |
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Accounts, Notes, Loans and Financing Receivable [Line Items] |
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Finance receivables |
191,316us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rm_ConvenienceChecksMember |
179,203us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rm_ConvenienceChecksMember |
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Large [Member] |
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Accounts, Notes, Loans and Financing Receivable [Line Items] |
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Finance receivables |
46,147us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rm_LargeLoansMember |
43,311us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rm_LargeLoansMember |
52,001us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rm_LargeLoansMember |
Automobile [Member] |
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Accounts, Notes, Loans and Financing Receivable [Line Items] |
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Finance receivables |
154,382us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_AutomobileLoanMember |
181,126us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_AutomobileLoanMember |
168,604us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_AutomobileLoanMember |
Retail [Member] |
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Accounts, Notes, Loans and Financing Receivable [Line Items] |
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Finance receivables |
$ 26,130us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rm_RetailLoansMember |
$ 31,268us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rm_RetailLoansMember |
$ 30,307us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rm_RetailLoansMember |