Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows From Operating Activities
Net Income	$ 531,415	$ 868,573	$ 412,680
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Net (Gains) Losses on Investments, Investment Securities and Contingent Consideration	16,458	(24,227)	(8,681)
Equity Method Investments, Including Gain on Sale	3,038	1,105	(1,636)
Equity-Based and Other Deferred Compensation	467,339	422,210	367,438
Net Loss on Sale and Wind-down of Operations in Mexico in 2020 and Release of Cumulative Foreign Exchange Losses	0	1,250	35,247
Noncash Lease Expense	41,534	40,761	38,626
Depreciation, Amortization and Accretion	28,651	28,655	30,002
Bad Debt Expense	5,513	(60)	6,878
Deferred Taxes	(855)	29,078	13,824
Decrease (Increase) in Operating Assets:
Investment Securities	(1,777)	(1,960)	3,559
Financial Instruments Owned and Pledged as Collateral at Fair Value	0	0	(1,516)
Securities Purchased Under Agreements to Resell	0	0	(399)
Accounts Receivable	(46,084)	16,028	(78,573)
Receivable from Employees and Related Parties	3,188	(1,622)	(1,170)
Other Assets	(116,838)	(4,649)	(19,043)
(Decrease) Increase in Operating Liabilities:
Accrued Compensation and Benefits	(353,201)	191,223	82,364
Accounts Payable and Accrued Expenses	(1,093)	(5,497)	(796)
Securities Sold Under Agreements to Repurchase	0	0	1,935
Payables to Employees and Related Parties	12,642	6,065	(7,980)
Taxes Payable	(11,138)	5,634	11,946
Other Liabilities	(47,416)	(187,669)	93,666
Net Cash Provided by Operating Activities	531,376	1,384,898	978,371
Cash Flows From Investing Activities
Investments Purchased	(80)	(6,660)	(143)
Proceeds from Redemption and Sale of Investments	18,300	20,967	0
Distributions of Private Equity Investments	238	827	650
Investment Securities:
Proceeds from Sales and Maturities of Investment Securities and Futures Contracts Activity	3,160,061	2,669,500	555,624
Purchases of Investment Securities and Futures Contracts Activity	(2,850,658)	(3,219,975)	(1,201,617)
Maturity of Certificates of Deposit	281,386	121,912	214,266
Purchase of Certificates of Deposit	(272,757)	(264,492)	0
Purchase of Furniture, Equipment and Leasehold Improvements	(23,187)	(27,971)	(53,330)
Proceeds from Sale of Business, Net of Cash Sold	0	0	679
Net Cash Provided by (Used In) Investing Activities	313,303	(705,892)	(483,871)
Cash Flows From Financing Activities
Issuance of Noncontrolling Interests	300	2,179	540
Distributions to Noncontrolling Interests	(45,548)	(67,865)	(44,915)
Payments Under Tax Receivable Agreement	(10,944)	(10,825)	(9,425)
Payment of Notes Payable	(67,000)	(38,000)	0
Issuance of Notes Payable	67,000	38,000	0
Debt Issuance Costs and Make-Whole Amount	(1,826)	(355)	0
Purchase of Treasury Stock and Noncontrolling Interests	(550,293)	(729,693)	(147,411)
Dividends	(127,257)	(118,762)	(106,582)
Net Cash Provided by (Used in) Financing Activities	(735,568)	(925,321)	(307,793)
Effect of Exchange Rate Changes on Cash	(24,281)	(4,616)	7,631
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	84,830	(250,931)	194,338
Cash, Cash Equivalents and Restricted Cash – Beginning of Period	587,293	838,224	643,886
Cash, Cash Equivalents and Restricted Cash – End of Period	672,123	587,293	838,224
SUPPLEMENTAL CASH FLOW DISCLOSURE
Payments for Interest	16,857	17,332	23,748
Payments for Income Taxes	217,696	191,970	111,319
Accrued Dividends	15,236	14,332	13,734
Amounts Due for Purchase of Noncontrolling Interest	0	48,297	851
Settlement of Sale of Trilantic VI	9,188	0	0
Settlement of Contingent Consideration	1,083	0	0
Receipt of Equity Securities in Settlement of Accounts Receivable	$ 0	$ 1,955	$ 0