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SECURITIES LENDING - Additional information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Offsetting [Abstract]
Interest expense - Securities lending and loan participations sold	$ 719	$ 35,383

X

- Definition

Refers to the amount of interest expenses associate with securities lending incurred during the period.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_OffsettingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration