Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net income (loss)	$ 422,978	$ 218,438	$ 135,692
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Bad debt expense	2,026	2,544	2,399
Depreciation and amortization	7,242	4,708	4,965
Equity-based compensation	167,938	133,623	124,212
Deferred tax provision	22,862	38,997	3,665
Gain on equity method investment	(30,091)
Gain on sale of investment			(20,714)
Other	(6,251)	(2,488)	(7,333)
Changes in assets and liabilities:
Accounts receivable	26,941	(46,698)	7,057
Accrued and other receivables	(14,721)	(983)	3,644
Prepaid expenses and other assets	(3,396)	1,236	(2,203)
Deferred compensation	505	(221)	(2,924)
Compensation payable	282,872	57,003	(35,381)
Accounts payable, accrued expenses and other liabilities	52,874	21,461	(2,569)
Deferred revenue	1,845	(347)	(4,051)
Dividends received	3,356	1,942	2,848
Net cash provided by (used in) operating activities	936,980	429,215	209,307
Cash flows from investing activities
Purchases of investments	(486,124)	(390,586)	(212,415)
Proceeds from sales of investments	456,302	391,494	120,102
Note payments received from (issued to) employees	70	(200)
Purchases of equipment and leasehold improvements	(16,426)	(40,659)	(6,467)
Proceeds from partial sale of equity method investment	29,164		46,907
Net cash provided by (used in) investing activities	(17,014)	(39,951)	(51,873)
Cash flows from financing activities
Payments for dividends and tax distributions	(479,963)	(282,920)	(209,178)
Payments under tax receivable agreement	(18,628)	(36,459)	(13,798)
Proceeds from exercise of stock options		11,923	21,459
Payments for treasury stock purchases	(104,150)	(44,334)	(51,175)
Other proceeds	200
Net cash provided by (used in) financing activities	(602,541)	(351,790)	(252,692)
Effect of exchange rate fluctuations on cash, cash equivalents, and restricted cash	305	(2,762)	2,059
Net increase (decrease) in cash, cash equivalents, and restricted cash	317,730	34,712	(93,199)
Cash, cash equivalents, and restricted cash, beginning of period	203,284	168,572	261,771
Cash, cash equivalents, and restricted cash, end of period	521,014	203,284	168,572
Cash paid during the period for:
Income taxes, net	55,189	(305)	13,405
Other non-cash activity
Non-cash settlement of accounts receivable	18,550
Settlement of partnership units not yet paid	118
Class A Partnership Units or other equity converted into Class A Common stock	26,964	14,964	1,267
Dividends in kind	63,374	41,144	33,299
Cumulative effect adjustment upon adoption of ASU 2016-13		364
Forfeiture of fully-vested Group LP units or other equity units	$ 25	$ 96	$ 2,397