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ORGANIZATION, BUSINESS OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 31, 2009
Mar. 31, 2014
Business Acquisition [Line Items]          
Stockholders' Equity, Reverse Stock Split 1 for 20 reverse split of its common stock        
Common Stock Shares Outstanding 15,977,482us-gaap_CommonStockOtherSharesOutstanding 1,500,107us-gaap_CommonStockOtherSharesOutstanding     30,002,975us-gaap_CommonStockOtherSharesOutstanding
Repayments of Long-term Debt $ 31,724us-gaap_RepaymentsOfLongTermDebt $ 1,724us-gaap_RepaymentsOfLongTermDebt $ 1,724us-gaap_RepaymentsOfLongTermDebt    
Interest Paid, Total 1,389us-gaap_InterestPaidNet        
Gains (Losses) on Extinguishment of Debt 18,759us-gaap_GainsLossesOnExtinguishmentOfDebt        
Notes Payable, Total 6,570us-gaap_NotesPayable 48,759us-gaap_NotesPayable      
Common Stock [Member]          
Business Acquisition [Line Items]          
Stock Issued During Period, Shares, New Issues 10,289,300us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Sale of Stock, Price Per Share $ 5.00us-gaap_SaleOfStockPricePerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Gross Proceeds from Issuance of Private Placement 51,233rily_GrossProceedsFromIssuanceOfPrivatePlacement
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Proceeds from Issuance of Private Placement 30,180us-gaap_ProceedsFromIssuanceOfPrivatePlacement
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Subordinated Unsecured Promissory Notes Payable [Member]          
Business Acquisition [Line Items]          
Debt Instrument, Face Amount       60,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= rily_SubordinatedUnsecuredPromissoryNotesPayableMember
 
Subordinated Unsecured Promissory Notes Payable [Member] | Andrew Gumaer and Harvey Yellen [Member]          
Business Acquisition [Line Items]          
Repayments of Long-term Debt 30,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= rily_SubordinatedUnsecuredPromissoryNotesPayableMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rily_AndrewGumaerAndHarveyYellenMember
       
Interest Paid, Total 180us-gaap_InterestPaidNet
/ us-gaap_LongtermDebtTypeAxis
= rily_SubordinatedUnsecuredPromissoryNotesPayableMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rily_AndrewGumaerAndHarveyYellenMember
       
Gains (Losses) on Extinguishment of Debt 18,759us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= rily_SubordinatedUnsecuredPromissoryNotesPayableMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rily_AndrewGumaerAndHarveyYellenMember
       
Notes Payable, Total $ 48,759us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= rily_SubordinatedUnsecuredPromissoryNotesPayableMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rily_AndrewGumaerAndHarveyYellenMember
$ 48,759us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= rily_SubordinatedUnsecuredPromissoryNotesPayableMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rily_AndrewGumaerAndHarveyYellenMember
     
Great American Global Partners [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Equity Interest Issued Or Issuable, Number Of Shares       528,000us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_TitleOfIndividualAxis
= rily_GreatAmericanMembersMember