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ORGANIZATION (Details)
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Apr. 30, 2014
Series A LLC Preferred Shares    
Definitive merger agreement    
Preferred shares, dividend rate (as a percent) 7.375%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		  
Predecessor Company | Series A LLC Preferred Shares    
Definitive merger agreement    
Preferred shares, dividend rate (as a percent)   7.375%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor Company | KFN | KKR & Co.    
Definitive merger agreement    
Stock exchange ratio to be applied in the merger transaction   0.51kfn_StockExchangeRatioMergerTransaction
/ us-gaap_BusinessAcquisitionAxis
= kfn_KKRFinancialHoldingsLLCMember
/ us-gaap_CounterpartyNameAxis
= kfn_KKRAndCoMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember