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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary Of Impact Of Allowance For Credit Losses During The period (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Receivables [Abstract]
Beginning balance	$ 139,400	$ 142,000	$ 150,000	$ 62,200
Impact of CECL adoption				60,100
COVID-19 reserve build (release)	(2,000)	(1,500)	(14,900)	31,900
General reserve build (release) due to portfolio change	12,700	3,500	15,000	(10,200)
Ending balance	$ 150,100	$ 144,000	$ 150,100	$ 144,000
Allowance as Percentage of Finance Receivables	11.40%	13.60%	11.40%	13.60%

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- Definition

The allowance for credit losses as a percentage of total finance receivables.

+ References

No definition available.

+ Details

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- Definition

Amount of build (release) in the allowance for credit losses related to the macroeconomic reserve related to COVID-19.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

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- Definition

The impact of CECL adoption on the beginning Allowance for Credit Losses.

+ References

No definition available.

+ Details

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Namespace Prefix:	rm_
Data Type:	xbrli:monetaryItemType
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- Definition

Amount of build (release) in the allowance for credit losses related to portfolio growth (liquidation).

+ References

No definition available.

+ Details

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X

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
-URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

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Balance Type:	credit
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- References

No definition available.

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