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Significant Accounting Policies - Additional Information (Detail) - Segment	1 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2016	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Number of segment		1
Contractual delinquent period of loans	180 days	180 days	180 days
Bankruptcy delinquency threshold			60 days
Financing receivable suspended period		90 days
Contractual delinquent period of accrual income		90 days
Tax benefit		50.00%
Office Building [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives		39 years
Minimum [Member] | Office Building [Member]
Significant Accounting Policies [Line Items]
Non cancellable lease period		1 year
Minimum [Member] | Furniture, Fixtures and Equipment [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives		3 years
Maximum [Member] | Office Building [Member]
Significant Accounting Policies [Line Items]
Non cancellable lease period		7 years
Maximum [Member] | Furniture, Fixtures and Equipment [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives		5 years
As Reported [Member]
Significant Accounting Policies [Line Items]
Contractual delinquent period of loans	365 days

X

- Definition

Threshold period past due for non-titled accounts in a confirmed bankruptcy to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

X

- Definition

Days contractually past due that interest is accrued.

+ References

No definition available.

+ Details

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

X

- Definition

Threshold period past due that interest accrual is suspended.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the amount as a percentage recognized for tax positions that are more likely than not to be sustained upon examination by tax authorities.

+ References

No definition available.

+ Details

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Namespace Prefix:	rm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Significant accounting policies.

+ References

No definition available.

+ Details

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

X

- Definition

Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LesseeLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Threshold period past due for financing receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
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X

- Details

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