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Subsequent Event - Additional Information (Detail) (Common Stock [Member], Subsequent Event [Member]) | Aug. 07, 2013
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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