Guarantor Obligation, Decrease

No definition available.

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Namespace Prefix:	rily_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Guarantor Obligations, Merger Termination Fee

+ References

No definition available.

+ Details

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Namespace Prefix:	rily_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount related to Indemnity amount.

+ References

No definition available.

+ Details

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

- Definition

Amount related to Indemnity rider received.

+ References

No definition available.

+ Details

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

- Definition

Services fees.

+ References

No definition available.

+ Details

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

- Definition

Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3

+ Details

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

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

+ Details

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

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

+ Details

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

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

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

- Definition

Amount of cash outflow for fees classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (g)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-25

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

+ Details

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Balance Type:	na
Period Type:	duration

- Details

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- Details

Name:	us-gaap_OtherCommitmentsAxis=rily_EquityCommitmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	srt_CounterpartyNameAxis=rily_FranchiseGroupIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_PaymentGuaranteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rily_BabcockAndWilcoxMember
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- Details

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Data Type:	na
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- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_GuaranteesMember
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Data Type:	na
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- Details

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COMMITMENTS AND CONTINGENCIES (Details) € in Thousands, $ in Thousands						6 Months Ended	12 Months Ended
	Apr. 20, 2023 USD ($)	Jan. 20, 2022 USD ($)	Dec. 22, 2021 EUR (€)	Aug. 26, 2020 USD ($)	Aug. 10, 2020 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	May 10, 2023 USD ($)	Jun. 30, 2021 USD ($)
Freedom VCM Holdings, LLC \| Equity Commitment
Related Party Transaction [Line Items]
Other commitment								$ 560,000
Franchise Group, Inc
Related Party Transaction [Line Items]
Guarantor obligations, maximum exposure, undiscounted								57,000
Payment Guarantee
Related Party Transaction [Line Items]
Guarantor obligations, current carrying value							$ 100
Guarantor obligation, decrease							$ 10
Babcock & Wilcox Enterprises, Inc.
Related Party Transaction [Line Items]
Services fees						$ 750
Indemnity amount	$ 8,991		€ 30,000		$ 29,970
Indemnity rider received				$ 600
Payments for other fees		$ 1,694
Franchise Group, Inc
Related Party Transaction [Line Items]
Termination fee, amount								$ 55,000
Guarantees \| Babcock & Wilcox Enterprises, Inc.
Related Party Transaction [Line Items]
Services fees						$ 935
Maximum \| Guarantees \| Babcock & Wilcox Enterprises, Inc.
Related Party Transaction [Line Items]
Contractual obligation									$ 110,000