Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities
Consolidated net (loss) income	$ (20,385)	$ (48,902)	$ 154,372
Adjustments to reconcile consolidated net loss to net cash provided by operating activities:
Amortization of equity-based compensation	127,505	87,130	84,169
Depreciation, amortization and net gains and losses on fixed assets	8,449	10,308	10,334
Net losses on early retirement of debt	6,375	14,303	0
Deferred income taxes	26,935	8,599	312,764
Non-cash lease expense	21,222	0	0
Net (gains) losses on investments, net of dividends	(4,577)	11,350	(3,465)
Operating cash flows due to changes in:
Income and fees receivable	(132,552)	300,450	(177,819)
Due from related parties	5,399	7,448	(7,708)
Other assets, net	7,733	30,607	(6,388)
Compensation payable	79,290	(106,645)	2,658
Unearned incentive income	(599)	17,109	47,631
Due to related parties	(2,674)	266	(222,563)
Operating lease liabilities	(18,286)	0	0
Other liabilities	1,107	(11,144)	(3,869)
Consolidated funds related items:
Net (gains) losses of consolidated funds	(3,768)	5,200	(8,472)
Purchases of investments	(128,917)	(378,626)	(423,147)
Proceeds from sale of investments	263,505	245,309	184,783
Other assets of consolidated funds	(31,832)	(7,769)	(307,379)
Other liabilities of consolidated funds	8,041	3,203	80,421
Net Cash Provided by (Used in) Operating Activities	211,971	188,196	(283,678)
Cash Flows from Investing Activities
Purchases of fixed assets	(1,935)	(5,830)	(4,990)
Proceeds from sale of fixed assets	0	0	57,599
Purchases of United States government obligations	(400,766)	(293,183)	(112,400)
Maturities of United States government obligations	437,574	129,781	100,000
Investments in funds	(110,650)	(179,930)	(165,519)
Return of investments in funds	60,957	180,415	6,959
Net Cash Used in Investing Activities	(14,820)	(168,747)	(118,351)
Cash Flows from Financing Activities
Issuance and sale of Preferred Units, net of issuance costs	0	0	150,054
Contributions from noncontrolling and redeemable noncontrolling interests	6,353	148,950	3,629
Distributions to noncontrolling and redeemable noncontrolling interests	(104,098)	(52,506)	(22,526)
Dividends on Class A Shares	(19,578)	(24,842)	(12,972)
Proceeds from debt obligations, net of issuance costs	3,423	301,558	154,490
Repayment of debt obligations, including prepayment costs	(192,790)	(595,463)	(167,516)
Proceeds from securities sold under agreements to repurchase, net of issuance costs	36,134	63,099	0
Proceeds from debt obligations of consolidated CLO	0	0	666,711
Repayment of debt obligations of consolidated CLO	0	0	222,434
Other, net	(5,040)	(5,874)	(7,707)
Net Cash (Used in) Provided by Financing Activities	(275,596)	(165,078)	541,729
Net change in cash and cash equivalents and restricted cash	(78,445)	(145,629)	139,700
Cash and Cash Equivalents and Restricted Cash, Beginning of Period	323,884	469,513	329,813
Cash and Cash Equivalents and Restricted Cash, End of Period	245,439	323,884	469,513	$ 329,813
Cash paid during the period:
Interest	11,583	28,472	20,904
Income taxes	4,978	2,930	4,156
Non-cash transactions:
Assets related to the initial consolidation of CLO	0	0	100,156
Liabilities related to the initial consolidation of CLO	0	0	99,878
Increase in paid-in capital as a result of tax receivable agreement amendment	50,967	0	10,520	$ 39,200
Assets related to funds deconsolidated	92,946	0	653,629
Liabilities related to funds deconsolidated	49,588	0	629,282
Reconciliation of cash and cash equivalents and restricted cash
Cash and Cash Equivalents, at Carrying Value	240,938	315,809	469,513
Restricted cash	$ 4,501	$ 8,075	$ 0