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BORROWINGS (Details 2) (USD $)
3 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2015
Feb. 28, 2015
Dec. 31, 2014
Sep. 16, 2014
Dec. 18, 2014
Mar. 02, 2015
Mar. 31, 2014
Jan. 23, 2014
May 07, 2015
Details of Company's borrowings                  
Fixed rate (as a percent)         4.90%us-gaap_LongTermDebtPercentageBearingFixedInterestRate        
Successor Company                  
Details of Company's borrowings                  
Collateralized loan obligation secured debt repaid $ 338,197,000us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
               
Successor Company | Senior Notes Non-Called Legacy CLO                  
Details of Company's borrowings                  
Collateralized loan obligation secured debt repaid 169,800,000us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_DebtInstrumentAxis
= kfn_SeniorNotesNonCalledLegacyCLOMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
               
Successor Company | CLO 2006-1 senior secured notes                  
Details of Company's borrowings                  
Extinguishment of Debt, Amount   181,800,000us-gaap_ExtinguishmentOfDebtAmount
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Derivative, Notional Amount, Terminated   84,000,000kfn_DerivativeNotionalAmountTerminated
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/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
             
Par amount of notes issued     166,841,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kfn_SeniorSecuredNotes2006CLO1Member
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
           
Successor Company | CLO 2007-A senior secured an junior secured mezzanine notes                  
Details of Company's borrowings                  
Collateralized loan obligation secured debt repaid     494,900,000us-gaap_RepaymentsOfSecuredDebt
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= kfn_SeniorSecuredAndJuniorSecuredMezzanineNotes2007CLOA.Member
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
           
Successor Company | CLO 2011-1 senior debt                  
Details of Company's borrowings                  
Par amount of notes issued 400,995,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kfn_SeniorDebt2011CLO1Member
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
  402,515,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kfn_SeniorDebt2011CLO1Member
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
           
Successor Company | CLO 2013-2 senior secured notes                  
Details of Company's borrowings                  
Par amount of notes issued 339,250,000us-gaap_DebtInstrumentFaceAmount
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= kfn_SeniorSecuredNotes2013CLO2Member
/ us-gaap_StatementScenarioAxis
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  339,250,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kfn_SeniorSecuredNotes2013CLO2Member
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
           
Successor Company | CLO 2013-1 senior secured notes                  
Details of Company's borrowings                  
Par amount of notes issued 458,500,000us-gaap_DebtInstrumentFaceAmount
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= kfn_SeniorSecuredNotes2013CLO1Member
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
  458,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kfn_SeniorSecuredNotes2013CLO1Member
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
           
Successor Company | CLO 9 notes                  
Details of Company's borrowings                  
Par amount of notes issued       518,000,000.0us-gaap_DebtInstrumentFaceAmount
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/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
         
Successor Company | CLO 9 senior secured notes                  
Details of Company's borrowings                  
Par amount of notes issued 463,750,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kfn_SeniorSecuredNotesCLO9Member
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
  463,750,000us-gaap_DebtInstrumentFaceAmount
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463,800,000.0us-gaap_DebtInstrumentFaceAmount
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= kfn_SeniorSecuredNotesCLO9Member
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
         
Successor Company | CLO 9 senior secured notes | LIBOR                  
Details of Company's borrowings                  
Percentage of margin added to reference rate to determine interest rate on debt (in percentage)       2.01%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
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/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
         
Successor Company | CLO 9 subordinated notes                  
Details of Company's borrowings                  
Par amount of notes issued 15,000,000us-gaap_DebtInstrumentFaceAmount
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  15,000,000us-gaap_DebtInstrumentFaceAmount
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15,000,000.0us-gaap_DebtInstrumentFaceAmount
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= kfn_SubordinatedNotesCLO9Member
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= us-gaap_SuccessorMember
         
Successor Company | CLO 10 notes                  
Details of Company's borrowings                  
Par amount of notes issued         415,600,000.0us-gaap_DebtInstrumentFaceAmount
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/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
       
Successor Company | CLO 10 senior notes                  
Details of Company's borrowings                  
Par amount of notes issued 368,000,000us-gaap_DebtInstrumentFaceAmount
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  368,000,000us-gaap_DebtInstrumentFaceAmount
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  368,000,000.0us-gaap_DebtInstrumentFaceAmount
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= us-gaap_SuccessorMember
       
Successor Company | CLO 10 senior notes | Nonaffiliates                  
Details of Company's borrowings                  
Floating rate senior secured note         343,000,000.0us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
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/ dei_LegalEntityAxis
= kfn_NonaffiliatedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
       
Percentage of margin added to reference rate to determine interest rate on debt (in percentage)         2.09%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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/ dei_LegalEntityAxis
= kfn_NonaffiliatedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
       
Fixed rate senior secured note         25,000,000.0us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
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= kfn_SeniorSecuredNotesCLO10Member
/ dei_LegalEntityAxis
= kfn_NonaffiliatedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
       
Successor Company | CLO 11 Warehouse Facility                  
Details of Company's borrowings                  
Par amount of notes issued 50,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kfn_CLOWarehouseFacilityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
               
Successor Company | CLO 11 Warehouse Facility | LIBOR                  
Details of Company's borrowings                  
Debt, variable interest rate basis           LIBOR      
Predecessor Company                  
Details of Company's borrowings                  
Collateralized loan obligation secured debt repaid             54,449,000us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Predecessor Company | Senior Notes Non-Called Legacy CLO                  
Details of Company's borrowings                  
Collateralized loan obligation secured debt repaid             54,400,000us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_DebtInstrumentAxis
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/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Predecessor Company | CLO 2011-1 senior debt                  
Details of Company's borrowings                  
Collateralized loan obligation secured debt repaid 1,500,000us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_DebtInstrumentAxis
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/ us-gaap_StatementScenarioAxis
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          0us-gaap_RepaymentsOfSecuredDebt
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= kfn_SeniorDebt2011CLO1Member
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Predecessor Company | CLO 2007-1 Class E secured notes                  
Details of Company's borrowings                  
Proceeds from senior notes             21,900,000us-gaap_ProceedsFromIssuanceOfDebt
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Par amount of notes issued             21,900,000.0us-gaap_DebtInstrumentFaceAmount
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/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Predecessor Company | CLO 2007-A Class G secured notes                  
Details of Company's borrowings                  
Proceeds from senior notes             30,200,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_DebtInstrumentAxis
= kfn_ClassGSecuredNotes2007CLOAMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Par amount of notes issued             29,800,000.0us-gaap_DebtInstrumentFaceAmount
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= kfn_ClassGSecuredNotes2007CLOAMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Predecessor Company | CLO 2007-A Class H secured notes                  
Details of Company's borrowings                  
Proceeds from senior notes             30,100,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_DebtInstrumentAxis
= kfn_ClassHSecuredNotes2007CLOAMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Par amount of notes issued             29,800,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kfn_ClassHSecuredNotes2007CLOAMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Predecessor Company | CLO 2013-2 senior secured notes                  
Details of Company's borrowings                  
Par amount of notes issued               384,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kfn_SeniorSecuredNotes2013CLO2Member
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Predecessor Company | CLO 2013-2 senior secured notes | Nonaffiliates                  
Details of Company's borrowings                  
Par amount of notes issued               339,300,000.0us-gaap_DebtInstrumentFaceAmount
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/ dei_LegalEntityAxis
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Floating rate senior secured note               319,300,000.0us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
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/ dei_LegalEntityAxis
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Debt, variable interest rate basis               three-month LIBOR  
Fixed rate senior secured note               20,000,000.0us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
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Fixed rate (as a percent)               3.74%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
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/ dei_LegalEntityAxis
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Predecessor Company | CLO 2013-2 senior secured notes | Nonaffiliates | LIBOR                  
Details of Company's borrowings                  
Percentage of margin added to reference rate to determine interest rate on debt (in percentage)               2.16%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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Subsequent Event | Successor Company | CLO 11 Notes                  
Details of Company's borrowings                  
Par amount of notes issued                 564,500,000us-gaap_DebtInstrumentFaceAmount
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Subsequent Event | Successor Company | CLO 11 senior secured notes | Nonaffiliates                  
Details of Company's borrowings                  
Par amount of notes issued                 507,800,000us-gaap_DebtInstrumentFaceAmount
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Percentage of margin added to reference rate to determine interest rate on debt (in percentage)                 2.06%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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Subsequent Event | Successor Company | CLO 11 subordinated notes | Nonaffiliates                  
Details of Company's borrowings                  
Par amount of notes issued                 $ 28,300,000.0us-gaap_DebtInstrumentFaceAmount
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