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SECURITIES LENDING - Additional information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Securities Lending [Abstract] |  |  |  |
Interest expense securities lending | $ 906 | $ 1,968 | $ 1,623 | $ 2,687

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- 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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- Definition Securities Lending [Abstract] + References No definition available. + Details
Name: | rily_SecuritiesLendingAbstract
Namespace Prefix: | rily_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration