Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash Flows From Operating Activities
Net Income	$ 153,790	$ 93,124
Adjustments to Reconcile Net Income to Net Cash Provided by (Used In) Operating Activities:
Net (Gains) Losses on Investments, Investment Securities and Contingent Consideration	7,120	(14,708)
Equity Method Investments	87	22
Equity-Based and Other Deferred Compensation	148,425	139,337
Noncash Lease Expense	12,209	9,928
Depreciation, Amortization and Accretion, net	2,565	1,911
Bad Debt Expense	2,590	(567)
Deferred Taxes	791	(47)
Decrease (Increase) in Operating Assets:
Investment Securities	6,443	12,346
Accounts Receivable	(47,143)	39,573
Receivable from Employees and Related Parties	(4,160)	(4,070)
Other Assets	(51,284)	53,051
(Decrease) Increase in Operating Liabilities:
Accrued Compensation and Benefits	(752,903)	(628,439)
Accounts Payable and Accrued Expenses	9,308	3,507
Payables to Employees and Related Parties	35,727	20,389
Taxes Payable	(2,764)	(2,807)
Other Liabilities	(70,454)	(3,771)
Net Cash Provided by (Used in) Operating Activities	(549,653)	(281,221)
Cash Flows From Investing Activities
Distributions of Private Equity Investments	1,215	0
Investment Securities:
Proceeds from Sales and Maturities of Investment Securities	1,043,959	1,272,891
Purchases of Investment Securities	(395,187)	(701,428)
Maturity of Certificates of Deposit	49,434	54,462
Purchase of Certificates of Deposit	0	(48,317)
Purchase of Furniture, Equipment and Leasehold Improvements	(19,660)	(1,105)
Net Cash Provided by Investing Activities	679,761	576,503
Cash Flows From Financing Activities
Issuance of Noncontrolling Interests	231	0
Distributions to Noncontrolling Interests	(8,365)	(9,438)
Payments Under Tax Receivable Agreement	(597)	(607)
Purchase of Treasury Stock and Noncontrolling Interests	(405,674)	(265,322)
Dividends	(46,452)	(43,236)
Net Cash Provided by (Used in) Financing Activities	(460,857)	(318,603)
Effect of Exchange Rate Changes on Cash	11,382	(3,767)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(319,367)	(27,088)
Cash, Cash Equivalents and Restricted Cash – Beginning of Period	882,107	605,484
Cash, Cash Equivalents and Restricted Cash – End of Period	562,740	578,396
SUPPLEMENTAL CASH FLOW DISCLOSURE
Payments for Interest	1,790	1,790
Payments for Income Taxes	27,107	15,305
Accrued Dividends	$ 3,763	$ 4,028