SEGMENT REPORTING (Financial Data for KKR's Reportable Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Management, Monitoring and Transaction Fees, Net
Fees and Other	$ 291,345us-gaap_InvestmentAdvisoryFees	$ 302,926us-gaap_InvestmentAdvisoryFees
Performance Income
Incentive Fees	5,639kkr_IncentiveFees	17,106kkr_IncentiveFees
Investment Income (Loss)
Total Investment Income (Loss)	2,182,835kkr_InvestmentIncomeLoss	2,196,113kkr_InvestmentIncomeLoss
Segment Expenses
Total Compensation and Benefits	364,999us-gaap_LaborAndRelatedExpense	331,038us-gaap_LaborAndRelatedExpense
Occupancy and Related Charges	15,732us-gaap_OperatingLeasesRentExpenseNet	15,408us-gaap_OperatingLeasesRentExpenseNet
Total Expenses	515,033us-gaap_NoninterestExpense	473,171us-gaap_NoninterestExpense
Less: Net income (loss) attributable to Noncontrolling Interests in consolidated entities and appropriated capital	1,431,561	1,482,674
Total Assets	67,286,990us-gaap_Assets		65,872,745us-gaap_Assets
Reportable segments
Management, Monitoring and Transaction Fees, Net
Management Fees	173,780	195,393
Monitoring Fees	97,838	36,363
Transaction Fees	103,286	163,516
Fee Credits	(80,494)	(84,668)
Fees and Other	294,410	310,604
Performance Income
Realized Carried Interest	302,425	193,550
Incentive Fees	5,665	17,019
Unrealized Carried Interest	139,284	145,647
Total Performance Income	447,374	356,216
Investment Income (Loss)
Net Realized Gains (Losses)	180,667	181,728
Net Unrealized Gains (Losses)	(10,721)	85,759
Total Realized and Unrealized	169,946	267,487
Net Interest and Dividends	50,675	11,164
Total Investment Income (Loss)	220,621	278,651
Total Segment Revenues	962,405	945,471
Segment Expenses
Cash Compensation and Benefits	107,027	108,915
Realized Allocation to Carry Pool (2)	120,970	77,420
Unrealized Allocation to Carry Pool (2)	55,631	58,690
Total Compensation and Benefits	283,628	245,025
Occupancy and Related Charges	14,796	14,189
Other Operating Expenses	60,946	52,801
Total Expenses	359,370	312,015
Less: Net income (loss) attributable to Noncontrolling Interests in consolidated entities and appropriated capital	3,622	3,202
Economic Net Income (Loss)	599,413	630,254
Total Assets	13,925,186	9,492,268
Fee Credits as a percentage of monitoring and transaction fees net of fund-related expenses	80.00%	80.00%
Equity ownership in the business (as a percent)	1.00%	1.00%
Reportable segments \| Private Markets
Management, Monitoring and Transaction Fees, Net
Management Fees	109,276	123,039
Monitoring Fees	97,838	36,363
Transaction Fees	46,599	93,020
Fee Credits	(69,906)	(80,338)
Fees and Other	183,807	172,084
Performance Income
Realized Carried Interest	302,425	168,800
Unrealized Carried Interest	126,937	145,776
Total Performance Income	429,362	314,576
Investment Income (Loss)
Net Realized Gains (Losses)	183,264	176,198
Net Unrealized Gains (Losses)	79,363	70,673
Total Realized and Unrealized	262,627	246,871
Net Interest and Dividends	(7,831)	(2,808)
Total Investment Income (Loss)	254,796	244,063
Total Segment Revenues	867,965	730,723
Segment Expenses
Cash Compensation and Benefits	73,967	66,898
Realized Allocation to Carry Pool (2)	120,970	67,520
Unrealized Allocation to Carry Pool (2)	50,693	58,743
Total Compensation and Benefits	245,630	193,161
Occupancy and Related Charges	11,016	11,560
Other Operating Expenses	42,116	40,059
Total Expenses	298,762	244,780
Less: Net income (loss) attributable to Noncontrolling Interests in consolidated entities and appropriated capital	719	515
Economic Net Income (Loss)	568,484	485,428
Total Assets	8,023,160	6,425,260
Reportable segments \| Public Markets
Management, Monitoring and Transaction Fees, Net
Management Fees	64,504	72,354
Transaction Fees	13,430	6,022
Fee Credits	(10,588)	(4,330)
Fees and Other	67,346	74,046
Performance Income
Realized Carried Interest	0	24,750
Incentive Fees	5,665	17,019
Unrealized Carried Interest	12,347	(129)
Total Performance Income	18,012	41,640
Investment Income (Loss)
Net Realized Gains (Losses)	684	5,479
Net Unrealized Gains (Losses)	(87,877)	14,814
Total Realized and Unrealized	(87,193)	20,293
Net Interest and Dividends	51,872	9,577
Total Investment Income (Loss)	(35,321)	29,870
Total Segment Revenues	50,037	145,556
Segment Expenses
Cash Compensation and Benefits	24,005	26,745
Realized Allocation to Carry Pool (2)	0	9,900
Unrealized Allocation to Carry Pool (2)	4,938	(53)
Total Compensation and Benefits	28,943	36,592
Occupancy and Related Charges	3,122	2,172
Other Operating Expenses	14,954	8,507
Total Expenses	47,019	47,271
Less: Net income (loss) attributable to Noncontrolling Interests in consolidated entities and appropriated capital	175	522
Economic Net Income (Loss)	2,843	97,763
Total Assets	4,560,080	1,633,796
Reportable segments \| Capital Markets
Management, Monitoring and Transaction Fees, Net
Transaction Fees	43,257	64,474
Fees and Other	43,257	64,474
Investment Income (Loss)
Net Realized Gains (Losses)	(3,281)	51
Net Unrealized Gains (Losses)	(2,207)	272
Total Realized and Unrealized	(5,488)	323
Net Interest and Dividends	6,634	4,395
Total Investment Income (Loss)	1,146	4,718
Total Segment Revenues	44,403	69,192
Segment Expenses
Cash Compensation and Benefits	9,055	15,272
Total Compensation and Benefits	9,055	15,272
Occupancy and Related Charges	658	457
Other Operating Expenses	3,876	4,235
Total Expenses	13,589	19,964
Less: Net income (loss) attributable to Noncontrolling Interests in consolidated entities and appropriated capital	2,728	2,165
Economic Net Income (Loss)	28,086	47,063
Total Assets	$ 1,341,946	$ 1,433,212

Represents the management fees received from providing investment management services.

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Represents the aggregate amount of cash expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

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Represents the total of fee related earnings and segment investment income reduced for carry pool allocations and management fee refunds and certain economic interests in KKR's segments held by third parties.

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Represents the portion of monitoring and transaction fees received from Portfolio Companies and allocable to certain of its investment funds, which the entity is required to share with limited partners of such investment funds.

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Represents the percentage of monitoring and transaction fees net of fund-related expenses shared with limited partners.

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Represents the incentives received from providing investment management services to unconsolidated funds, a specialty finance company, structured finance vehicles and separately managed accounts.

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Sum of net gains (losses) from investment activities, dividend income and interest income, less interest expense.

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Represents the monitoring fees received primarily in connection with providing services to Portfolio Companies.

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The portion of net income or loss attributable to third parties that hold interests in entities that are consolidated, which is deducted in order to derive the portion attributable to the parent.

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Income (loss) from other investments.

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Represents carried interest less carry pool allocation and management fee refunds.

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Represents amount of realized carried interest allocated to the carry pool.

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Represents realized income (loss) from other investments.

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Total realized carried interest recognized by the entity based on the investment results achieved.

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Represents the transaction fees received in connection with successful private equity and other investment transactions and capital markets activities.

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Represents amount of unrealized carried interest allocated to the carry pool.

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Represents unrealized income (loss) from other investments.

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Total unrealized carried interest based on the investment results achieved.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of fees earned from providing investment advice and research to customers.

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Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

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The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Total aggregate amount of all noninterest expense.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Other noninterest expenses that are not separately presented in any other noninterest expense category.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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