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Finance Receivables, Allowance for Credit Losses, and Credit Quality Information - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Receivables [Abstract]
Finance receivables	1.00%	1.10%
Contractual delinquent period of loans	180 days

X

- Definition

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

+ References

No definition available.

+ Details

Name:	rm_PercentageOfFinanceReceivablesAssociatedWithCustomersInBankruptcyAsToAggregateFinanceReceivable
Namespace Prefix:	rm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Threshold period past due for financing receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_ThresholdPeriodPastDueForWriteoffOfFinancingReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration