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Stockholders' Equity - Additional information (Detail) - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Stockholders' Equity Note [Abstract]
Repurchase shares of common stock		$ 30,000,000
Stock repurchase program expiration date	Dec. 31, 2026
Number of common shares repurchased	292
Total cost of common stock repurchased including commissions and estimated excise taxes	$ 10,100,000

X

- Definition

Stock repurchase program, number of shares repurchased.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Stock repurchase program, value of shares repurchased.

+ References

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+ Details

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Namespace Prefix:	rm_
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Balance Type:	credit
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X

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

+ Details

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Period Type:	instant

X

- Definition

Expiration date for purchase of share under share repurchase plan, in YYYY-MM-DD format. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

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- References

No definition available.

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