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

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- 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

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- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration