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Insurance Products and Reinsurance of Certain Risks - Additional Information (Detail) - USD ($) | 12 Months Ended | 30 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Insurance [Line Items] |  |  |
Restricted cash | $ 8,297,000 | $ 8,297,000 | $ 10,506,000
Letter of credit | $ 2,000,000 | 2,000,000 | 2,900,000
Term of CPI Policy | 1 year |  |
CPI policy commission earned |  | 0 |
Letter of Credit [Member] |  |  |
Insurance [Line Items] |  |  |
Restricted cash | $ 3,900,000 | $ 3,900,000 | $ 2,900,000

X
- Definition Commissions earned by the company for collateral protection collision insurance sold to customers. + References No definition available. + Details
Name: | rm_CollisionProtectionInsurancePolicyCommissionEarned
Namespace Prefix: | rm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Insurance [Line Items] + References No definition available. + Details
Name: | rm_InsuranceLineItems
Namespace Prefix: | rm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The period of time over which collision protection insurance is provided and related income is recognized. + References No definition available. + Details
Name: | rm_TermOfCollisionProtectionInsurancePolicy
Namespace Prefix: | rm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |