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Subsequent Event - Additional Information (Detail) (Common Stock [Member], Subsequent Event [Member])	Aug. 07, 2013
Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock shares authorized under shelf registration statement	7,263,599

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- Definition

Common Stock Shares Available To Sell Under Agreement, Shares

+ References

No definition available.

+ Details

Name:	rm_CommonStockSharesAvailableToSellUnderAgreementShares
Namespace Prefix:	rm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- Details

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