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CORPORATE LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 4) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Concentration risk    
Estimated fair value of corporate loans 6,031,524kfn_CorporateLoansAtEstimatedFairValue 6,506,564kfn_CorporateLoansAtEstimatedFairValue
Successor Company | Corporate Loans    
Concentration risk    
Number of issuers with whom a specified percentage of estimated fair value or amortized cost of corporate loans is concentrated 20kfn_ConcentrationRiskCorporateLoansWithNumberOfIssuers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= kfn_CorporateLoanHeldForInvestmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 20kfn_ConcentrationRiskCorporateLoansWithNumberOfIssuers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= kfn_CorporateLoanHeldForInvestmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Number of issuers with the largest concentration of corporate loans 3kfn_NumberOfConcentrationRiskCorporateLoansWithNumberOfIssuers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= kfn_CorporateLoanHeldForInvestmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 3kfn_NumberOfConcentrationRiskCorporateLoansWithNumberOfIssuers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= kfn_CorporateLoanHeldForInvestmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Successor Company | Corporate Loans | Percent to total investment in corporate loans, debt securities and other investments | Top Twenty Issuers    
Concentration risk    
Concentration risk (as a percent) 36.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= kfn_CorporateLoanHeldForInvestmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= kfn_TopTwentyIssuersMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 38.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= kfn_CorporateLoanHeldForInvestmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= kfn_TopTwentyIssuersMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Successor Company | Corporate Loans | Percent to total investment in corporate loans, debt securities and other investments | Top three largest    
Concentration risk    
Concentration risk (as a percent) 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= kfn_CorporateLoanHeldForInvestmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= kfn_TopThreeLargestMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= kfn_CorporateLoanHeldForInvestmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= kfn_TopThreeLargestMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Estimated fair value of corporate loans 613,700kfn_CorporateLoansAtEstimatedFairValue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= kfn_CorporateLoanHeldForInvestmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= kfn_TopThreeLargestMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 700,400kfn_CorporateLoansAtEstimatedFairValue
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= kfn_CorporateLoanHeldForInvestmentMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= kfn_TopThreeLargestMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember