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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of contract with customer, contract liability (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)
Contract with Customer, Liability [Roll Forward]
Deferred revenue at the beginning	$ 49,907
Additions to deferred revenue during the period	35,317
Reductions to deferred revenue for revenue recognized during the period	(36,494)
Deferred revenue at the ending	$ 48,730

X

- Definition

Contract With Customer, Liability, Increase From Deferral Of Revenue

+ References

No definition available.

+ Details

Name:	rily_ContractWithCustomerLiabilityIncreaseFromDeferralOfRevenue
Namespace Prefix:	rily_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer Liability Revenue Recognized Including Opening Balance

+ References

No definition available.

+ Details

Name:	rily_ContractWithCustomerLiabilityRevenueRecognizedIncludingOpeningBalance
Namespace Prefix:	rily_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract with Customer, Liability

+ References

No definition available.

+ Details

Name:	rily_ContractWithCustomerLiabilityRollForward
Namespace Prefix:	rily_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

+ Details

Name:	us-gaap_ContractWithCustomerLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant