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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
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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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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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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
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Balance Type: | na
Period Type: | duration

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- 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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- 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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- 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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Period Type: | duration

X
- Details
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Balance Type: |
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- Details
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- Details
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- Details
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- Details
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