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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Successor Company    
Collateralized Debt Obligation disclosures    
Collateralized loan obligation secured notes $ 5,949,477,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_StatementScenarioAxis
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$ 6,237,674,000us-gaap_DebtInstrumentCarryingAmount
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= us-gaap_SuccessorMember
Successor Company | Collateralized Debt Obligation (CLOs) VIEs    
Collateralized Debt Obligation disclosures    
Corporate debt investment, par amount 6,000,000,000kfn_CorporateDebtInvestmentsPar
/ us-gaap_StatementScenarioAxis
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/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
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Estimated fair value of corporate debt investments 5,800,000,000us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue
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/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
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Successor Company | Collateralized Debt Obligation (CLOs) VIEs | Nonaffiliates    
Collateralized Debt Obligation disclosures    
Collateralized loan obligation secured notes 5,200,000,000us-gaap_DebtInstrumentCarryingAmount
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Predecessor Company | Collateralized Debt Obligation (CLOs) VIEs    
Collateralized Debt Obligation disclosures    
Corporate debt investment, par amount   6,900,000,000kfn_CorporateDebtInvestmentsPar
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryAggregatedDisclosureMember
Estimated fair value of corporate debt investments   6,500,000,000us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
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Predecessor Company | Collateralized Debt Obligation (CLOs) VIEs | Nonaffiliates    
Collateralized Debt Obligation disclosures    
Collateralized Loan Obligation Secured Notes   5,500,000,000kfn_CollateralizedLoanObligationSecuredNotes
/ dei_LegalEntityAxis
= kfn_NonaffiliatedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryAggregatedDisclosureMember
Accounting Standards Update 2014-13 | Successor Company    
Collateralized Debt Obligation disclosures    
Cumulative effect adjustment from adoption of accounting guidance $ 1,900,000us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1
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= kfn_AccountingStandardsUpdate201413Member
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