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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Additional Information (Detail) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2016 | Dec. 31, 2015
Receivables [Abstract] |  |
Impaired finance receivables as a percentage of total finance receivables | 1.40% | 1.20%

X
- Definition Percentage of total finance receivable held by the company with customers that are involved in bankruptcy proceedings. + References No definition available. + Details
Name: | rm_PercentageOfFinanceReceivablesAssociatedWithCustomersInBankruptcyAsToAggregateFinanceReceivable
Namespace Prefix: | rm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration