SEGMENT REPORTING (Details) - USD ($)	1 Months Ended	2 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended
	Apr. 30, 2014	Jun. 30, 2014	Jun. 30, 2015	Apr. 30, 2014	Jun. 30, 2015	Dec. 31, 2014
Segment Reporting Information
Total assets			$ 9,037,291,000		$ 9,037,291,000	$ 8,951,625,000
Predecessor Company
Segment Reporting Information
Total revenues	$ 76,652,000			$ 217,242,000
Total investment costs and expenses	28,055,000			101,825,000
Total other income (loss)	(16,506,000)			56,334,000
Total other expenses	34,151,000			65,609,000
Income tax expense (benefit)	(143,000)			(162,000)
Net income (loss)	(2,203,000)			105,980,000
Net income (loss) attributable to noncontrolling interests	0			0
Net income (loss) attributable to KKR Financial Holdings LLC and Subsidiaries	(2,203,000)			105,980,000
Total CLO management fees	4,224,000			29,841,000
Predecessor Company | Reportable Segments | Credit
Segment Reporting Information
Total revenues	37,693,000			134,255,000
Total investment costs and expenses	16,612,000			62,485,000
Total other income (loss)	11,530,000			76,046,000
Total other expenses	7,286,000			23,121,000
Income tax expense (benefit)	(127,000)			(146,000)
Net income (loss)	25,198,000			124,549,000
Predecessor Company | Reportable Segments | Natural Resources
Segment Reporting Information
Total revenues	17,754,000			61,782,000
Total investment costs and expenses	11,339,000			38,915,000
Total other income (loss)	(2,734,000)			(8,123,000)
Total other expenses	479,000			1,633,000
Income tax expense (benefit)	0			0
Net income (loss)	3,202,000			13,111,000
Predecessor Company | Reportable Segments | Other
Segment Reporting Information
Total revenues	21,205,000			21,205,000
Total investment costs and expenses	104,000			425,000
Total other income (loss)	(25,302,000)			(11,589,000)
Total other expenses	90,000			230,000
Income tax expense (benefit)	(16,000)			(16,000)
Net income (loss)	(4,307,000)			8,945,000
Predecessor Company | Reconciling Items
Segment Reporting Information
Total revenues	0			0
Total investment costs and expenses	0			0
Total other income (loss)	0			0
Total other expenses	26,296,000			40,625,000
Income tax expense (benefit)	0			0
Net income (loss)	(26,296,000)			(40,625,000)
Total CLO management fees	0			12,900,000
Successor Company
Segment Reporting Information
Total revenues		$ 94,313,000	105,691,000		203,477,000
Total investment costs and expenses		55,664,000	62,450,000		120,103,000
Total other income (loss)		20,887,000	8,035,000		(61,129,000)
Total other expenses		14,364,000	12,269,000		29,437,000
Income tax expense (benefit)		(28,000)	(729,000)		(1,076,000)
Net income (loss)		45,144,000	38,278,000		(8,268,000)
Net income (loss) attributable to noncontrolling interests		0	(2,705,000)		(8,776,000)
Net income (loss) attributable to KKR Financial Holdings LLC and Subsidiaries		45,144,000	40,983,000		508,000
Total CLO management fees		10,406,000	9,817,000		20,037,000
Successor Company | Reportable Segments | Credit
Segment Reporting Information
Total revenues		62,311,000	90,520,000		185,478,000
Total investment costs and expenses		35,410,000	59,331,000		115,298,000
Total other income (loss)		17,113,000	(842,000)		(66,834,000)
Total other expenses		12,753,000	12,014,000		28,417,000
Income tax expense (benefit)		(24,000)	(14,000)		(62,000)
Net income (loss)		31,237,000	18,319,000		(25,133,000)
Net income (loss) attributable to noncontrolling interests			182,000		(5,676,000)
Net income (loss) attributable to KKR Financial Holdings LLC and Subsidiaries			18,137,000		(19,457,000)
Total assets			8,493,315,000		8,493,315,000	8,438,227,000
Successor Company | Reportable Segments | Natural Resources
Segment Reporting Information
Total revenues		31,930,000	6,351,000		9,179,000
Total investment costs and expenses		20,057,000	2,706,000		4,046,000
Total other income (loss)		(4,880,000)	(6,348,000)		(14,101,000)
Total other expenses		1,393,000	176,000		686,000
Income tax expense (benefit)		0	0		0
Net income (loss)		5,600,000	(2,879,000)		(9,654,000)
Net income (loss) attributable to noncontrolling interests			(2,887,000)		(3,100,000)
Net income (loss) attributable to KKR Financial Holdings LLC and Subsidiaries			8,000		(6,554,000)
Total assets			290,882,000		290,882,000	300,281,000
Successor Company | Reportable Segments | Other
Segment Reporting Information
Total revenues		72,000	8,820,000		8,820,000
Total investment costs and expenses		197,000	413,000		759,000
Total other income (loss)		8,654,000	15,225,000		19,806,000
Total other expenses		183,000	79,000		234,000
Income tax expense (benefit)		(4,000)	(715,000)		(1,014,000)
Net income (loss)		8,342,000	22,838,000		26,619,000
Net income (loss) attributable to noncontrolling interests			0		0
Net income (loss) attributable to KKR Financial Holdings LLC and Subsidiaries			22,838,000		26,619,000
Total assets			253,094,000		253,094,000	213,006,000
Successor Company | Reconciling Items
Segment Reporting Information
Total revenues		0	0		0
Total investment costs and expenses		0	0		0
Total other income (loss)		0	0		0
Total other expenses		35,000	0		100,000
Income tax expense (benefit)		0	0		0
Net income (loss)		$ (35,000)	0		(100,000)
Net income (loss) attributable to noncontrolling interests			0		0
Net income (loss) attributable to KKR Financial Holdings LLC and Subsidiaries			0		(100,000)
Total assets			0		0	111,000
Noncontrolling interests | Successor Company
Segment Reporting Information
Net income (loss)					(8,776,000)
Total assets			93,800,000		93,800,000	100,200,000
Noncontrolling interests | Successor Company | Credit
Segment Reporting Information
Total assets			57,000,000		57,000,000	62,700,000
Noncontrolling interests | Successor Company | Natural Resources
Segment Reporting Information
Total assets			$ 36,800,000		$ 36,800,000	$ 37,400,000
Merger Transaction Costs | Predecessor Company | Reconciling Items
Segment Reporting Information
Total CLO management fees	$ 22,700,000			$ 22,700,000