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Disclosure About Fair Value of Financial Instruments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Turnover rate of loan portfolio	1.3

X

- Definition

The annual turnover of the finance receivables in the portfolio.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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