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SECURITIES LENDING - Additional information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Offsetting [Abstract] |  |  |  |
Interest expense - Securities lending and loan participations sold | $ 1,968 | $ 23,313 | $ 2,687 | $ 58,696

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

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- References No definition available. + Details
Name: | us-gaap_OffsettingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration