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Credit Insurance Products - Additional Information (Detail) (USD $)
1 Months Ended 12 Months Ended
Apr. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Insurance [Line Items]        
Increase in letter of credit secured by cash deposit $ 1,900,000us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet      
Letter of credit secured by cash deposit   1,900,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForLetterOfCreditFacilities    
Restricted cash   1,900,000us-gaap_RestrictedCashAndCashEquivalents 1,900,000us-gaap_RestrictedCashAndCashEquivalents  
Term of CPI Policy   1 year    
Recognized revenue   185,000rm_GuaranteedAutoProtectionRevenue 242,000rm_GuaranteedAutoProtectionRevenue 251,000rm_GuaranteedAutoProtectionRevenue
Letter of Credit [Member]        
Insurance [Line Items]        
Restricted cash   1,900,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
1,900,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
 
After July 1, 2014 [Member]        
Insurance [Line Items]        
CPI policy commission earned   $ 0rm_CollisionProtectionInsurancePolicyCommissionEarned
/ us-gaap_StatementScenarioAxis
= rm_AfterJulyFirstTwoThousandFourteenMember