FAIR VALUE - Valuation Techniques (Details) $ in Thousands	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Consolidated Funds
Assets
Equity securities	$ 264,202	$ 227,031
Partnership interests	244,157	239,624
Collateralized loan obligations	10,174,794	9,958,076
Other fixed income	10,852,660	10,410,442
Derivative instruments	325
Total derivative assets, at fair value	11,361,344	10,878,201
Liabilities
Derivative instruments	(18,513)
Total liabilities, at fair value	(10,193,307)	(9,958,120)
Consolidated Funds | Level III
Assets
Equity securities	259,246	221,043
Partnership interests	237,558	231,857
Collateralized loan obligations	0	0
Other fixed income	402,676	542,306
Derivative instruments	325
Total derivative assets, at fair value	899,805	996,310
Liabilities
Derivative instruments	(1,513)	(44)
Total liabilities, at fair value	(1,513)	$ (44)
Consolidated Funds | Level III  | Discount Rates
Significant Unobservable Input(s)
Partnership interest		0.238
Consolidated Funds | Level III  | Discount Rates | Weighted Average
Significant Unobservable Input(s)
Partnership interest		0.238
Consolidated Funds | Level III  | Illiquidity discount
Significant Unobservable Input(s)
Equity securities		0.250
Consolidated Funds | Level III  | Illiquidity discount | Weighted Average
Significant Unobservable Input(s)
Equity securities		0.250
Consolidated Funds | Level III  | Transaction price
Assets
Equity securities	258,336	$ 188,044
Other fixed income	14,791
Consolidated Funds | Level III  | Discounted Cash Flow
Assets
Partnership interests	$ 237,558	231,857
Consolidated Funds | Level III  | Discounted Cash Flow | Discount Rates
Significant Unobservable Input(s)
Partnership interest	0.224
Consolidated Funds | Level III  | Discounted Cash Flow | Discount Rates | Weighted Average
Significant Unobservable Input(s)
Partnership interest	0.224
Consolidated Funds | Level III  | Market Approach
Assets
Equity securities	$ 896	438
Other fixed income		$ 6,605
Consolidated Funds | Level III  | Market Approach | EBITDA multiple | Minimum
Significant Unobservable Input(s)
Equity securities	1.8	2.9
Fixed income securities		6.5
Consolidated Funds | Level III  | Market Approach | EBITDA multiple | Maximum
Significant Unobservable Input(s)
Equity securities	83.3	19.5
Fixed income securities		7.8
Consolidated Funds | Level III  | Market Approach | EBITDA multiple | Weighted Average
Significant Unobservable Input(s)
Equity securities	15.3	13.4
Fixed income securities		6.9
Consolidated Funds | Level III  | Other
Assets
Equity securities		$ 32,528
Other fixed income	$ 28,766	$ 28,320
Consolidated Funds | Level III  | Other | Net income multiple
Significant Unobservable Input(s)
Equity securities		30.0
Consolidated Funds | Level III  | Other | Net income multiple | Weighted Average
Significant Unobservable Input(s)
Equity securities		30.0
Consolidated Funds | Level III  | Broker quotes and/or 3rd party pricing services
Assets
Equity securities	14	$ 33
Other fixed income	261,064	384,419
Derivative instruments	325	1,104
Liabilities
Derivative instruments	(1,513)
Consolidated Funds | Level III  | Income approach
Assets
Other fixed income	$ 98,055	$ 122,962
Consolidated Funds | Level III  | Income approach | Yield | Minimum
Significant Unobservable Input(s)
Fixed income securities	1.8	0.027
Consolidated Funds | Level III  | Income approach | Yield | Maximum
Significant Unobservable Input(s)
Fixed income securities	54.7	0.481
Consolidated Funds | Level III  | Income approach | Yield | Weighted Average
Significant Unobservable Input(s)
Fixed income securities	6.5	0.079
Ares Management L.P
Assets
Equity securities	$ 109,807	$ 89,419
Partnership interests	8,618	3,784
Total derivative assets, at fair value	177,093	147,992
Liabilities
Contingent consideration	(41,413)
Derivative instruments		(1,565)
Total liabilities, at fair value	(41,678)	(1,565)
Ares Management L.P | Level III
Assets
Equity securities	108,397	88,412
Partnership interests	2,575	2,575
Total derivative assets, at fair value	165,279	144,336
Liabilities
Contingent consideration	(41,413)
Derivative instruments		0
Total liabilities, at fair value	(41,413)	0
Ares Management L.P | Level III  | Transaction price
Assets
Equity securities	14,704	14,704
Ares Management L.P | Level III  | Discounted Cash Flow
Assets
Equity securities	$ 46,765	$ 32,905
Ares Management L.P | Level III  | Discounted Cash Flow | Discount Rates | Minimum
Significant Unobservable Input(s)
Equity securities	0.140	0.140
Ares Management L.P | Level III  | Discounted Cash Flow | Discount Rates | Maximum
Significant Unobservable Input(s)
Equity securities	0.200	0.200
Ares Management L.P | Level III  | Discounted Cash Flow | Discount Rates | Weighted Average
Significant Unobservable Input(s)
Equity securities	0.153
Ares Management L.P | Level III  | Market Approach
Assets
Equity securities	$ 46,928	$ 40,803
Ares Management L.P | Level III  | Market Approach | Multiple of Book Value
Significant Unobservable Input(s)
Equity securities	1.5	1.6
Ares Management L.P | Level III  | Other
Assets
Partnership interests	$ 2,575	$ 2,575
Other fixed income	21,583	21,583
Liabilities
Contingent consideration	(32,813)
Ares Management L.P | Level III  | Broker quotes and/or 3rd party pricing services
Assets
Collateralized loan obligations	32,724	$ 31,766
Ares Management L.P | Level III  | Monte Carlo simulation
Liabilities
Contingent consideration	$ (8,600)
Ares Management L.P | Level III  | Monte Carlo simulation | Discount Rates
Significant Unobservable Input(s)
Contingent consideration	8
Ares Management L.P | Level III  | Monte Carlo simulation | Volatility
Significant Unobservable Input(s)
Contingent consideration	0.17