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SECURITIES (Details 2) (Successor Company, Corporate Debt Securities, USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
issuer
security
Dec. 31, 2014
security
issuer
Successor Company | Corporate Debt Securities
    
Gross unrealized losses and estimated fair value of available-for-sale securities    
Number of issuers with corporate debt securities in default 1kfn_CorporateDebtSecuritiesInDefaultNumberOfIssuers
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 1kfn_CorporateDebtSecuritiesInDefaultNumberOfIssuers
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Estimated fair value of corporate debt security in default $ 6.9kfn_CorporateDebtSecuritiesInDefaultEstimatedFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 $ 8.7kfn_CorporateDebtSecuritiesInDefaultEstimatedFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Number of corporate debt securities in default 1kfn_CorporateDebtSecuritiesInDefaultNumber
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 1kfn_CorporateDebtSecuritiesInDefaultNumber
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember