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Debt - Additional Information (Detail) (Revolving Credit Facility [Member], USD $) In Millions, unless otherwise specified | 1 Months Ended | 6 Months Ended
--- | --- | ---
May 13, 2013 | Jun. 30, 2013
Line of Credit Facility [Line Items] |  |
Senior Secured Revolving Credit Facility Maximum Borrowing Amount | $ 500 |
Senior Secured Revolving Credit Facility Maturity Year and Month |  | 2016-05
Line of credit facility accordion amount | 75 |
Line of credit facility additional accordion amount | $ 100 |
Senior Secured Revolving Credit Facility, Basis Spread on Variable Rate |  | 1.00%
Pays an unused line fee per annum |  | 0.005%
Decreases unused line fee |  | 0.00375%
London Interbank Offered Rate (LIBOR) [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest rate prime plus |  | 3.00%
Senior Secured Revolving Credit Facility, Description of Variable Rate Basis |  | the Company elects between one month and six months, with a LIBOR floor of 1.00%, plus an applicable margin (which was 3.00% as of June 30, 2013) based on its leverage ratio
Prime Rate [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest rate prime plus |  | 2.00%
Senior Secured Revolving Credit Facility, Description of Variable Rate Basis |  | the Company may pay interest at a rate based on the prime rate plus an applicable margin (which was 2.00% as of June 30, 2013)

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- Definition Debt Instrument Maturity Month And Year + References No definition available. + Details
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Namespace Prefix: | rm_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | instant

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- Definition Line Of Credit Facility Accordion Feature + References No definition available. + Details
Name: | rm_LineOfCreditFacilityAccordionFeature
Namespace Prefix: | rm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line of Credit Facility Accordion Feature Additional Borrowing Capacity + References No definition available. + Details
Name: | rm_LineOfCreditFacilityAccordionFeatureAdditionalBorrowingCapacity
Namespace Prefix: | rm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of credit facility basis spread on variable rate. + References No definition available. + Details
Name: | rm_LineOfCreditFacilityBasisSpreadOnVariableRate
Namespace Prefix: | rm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of credit facility decrease commitment fee percentage. + References No definition available. + Details
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Namespace Prefix: | rm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration