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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Employee Benefit Plans [Line Items]
Minimum service period required	1 year
Expense of employee related plan	$ 0.8	$ 0.6	$ 0.5
Matching Contribution up to 3% [Member]
Employee Benefit Plans [Line Items]
Matching contribution	100.00%	100.00%	100.00%
Matching Contribution 3 to 5% [Member]
Employee Benefit Plans [Line Items]
Matching contribution	50.00%	50.00%	50.00%
Employee Contribution Matched at 100% [Member]
Employee Benefit Plans [Line Items]
Employee contribution	3.00%	3.00%	3.00%
Employee Contribution Matched at 50% [Member]
Employee Benefit Plans [Line Items]
Employee contribution	2.00%	2.00%	2.00%

X

- Definition

The minimum required service period in order to qualify for participation in the retirement plan.

+ References

No definition available.

+ Details

Name:	rm_DefinedContributionPlanQualificationCriteriaServicePeriodMinimum
Namespace Prefix:	rm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Employee Benefit Plans [Line Items]

+ References

No definition available.

+ Details

Name:	rm_EmployeeBenefitPlansLineItems
Namespace Prefix:	rm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedContributionPlanTypeAxis=rm_MatchingContributionThreeToFivePercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedContributionPlanTypeAxis=rm_ContributionMatchedAtHundredPercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedContributionPlanTypeAxis=rm_ContributionMatchedAtFiftyPercentMember
Namespace Prefix:
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Period Type: