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Disclosure about Fair Value of Financial Instruments - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2013
Fair Value Disclosures [Abstract]
Turnover rate of loan portfolio	1.3

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- Definition

Finance receivable portfolio turnover rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	rm_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

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- Details

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