Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows From Operating Activities
Net Income	$ 442,851	$ 179,207	$ 148,512
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Net (Gains) Losses on Investments, Marketable Securities and Contingent Consideration	10,718	(32)	1,124
Equity Method Investments	1,352	(513)	2,602
Equity-Based and Other Deferred Compensation	293,507	230,268	258,295
Impairment of Goodwill and Equity Method Investments	0	21,507	8,100
Gain on Sale of Institutional Trust and Independent Fiduciary business of ETC	0	(7,808)	0
Depreciation, Amortization and Accretion	29,374	26,032	25,223
Bad Debt Expense	3,365	2,579	2,261
Adjustment to Tax Receivable Agreement	0	(77,535)	0
Release of Cumulative Foreign Exchange Losses	0	16,266	0
Deferred Taxes	(3,981)	148,320	10,043
Decrease (Increase) in Operating Assets:
Marketable Securities	(546)	865	937
Financial Instruments Owned and Pledged as Collateral at Fair Value	(2,961)	35	18,249
Securities Purchased Under Agreements to Resell	8,166	2,642	(11,890)
Accounts Receivable	(130,956)	47,120	(64,522)
Receivable from Employees and Related Parties	(6,849)	(2,188)	5,934
Other Assets	(21,830)	(10,982)	(32,763)
(Decrease) Increase in Operating Liabilities:
Accrued Compensation and Benefits	208,088	(25,892)	48,258
Accounts Payable and Accrued Expenses	5,496	1,149	(10,030)
Securities Sold Under Agreements to Repurchase	(5,183)	(2,701)	(6,387)
Payables to Employees and Related Parties	4,387	3,217	(1,581)
Taxes Payable	16,099	(10,849)	9,097
Other Liabilities	(1,523)	(33,471)	10,424
Net Cash Provided by Operating Activities	849,574	507,236	421,886
Cash Flows From Investing Activities
Investments Purchased	(95)	(997)	(2,047)
Distributions of Private Equity Investments	2,143	2,072	183
Marketable Securities:
Proceeds from Sales and Maturities	191,779	45,642	46,547
Purchases	(336,596)	(40,995)	(69,568)
Maturity of Certificates of Deposit	63,527	0	0
Purchase of Certificates of Deposit	(100,000)	(63,417)	0
Cash Paid for Acquisitions and Deconsolidation of Cash, net of Cash Acquired	0	0	(2,877)
Purchase of Furniture, Equipment and Leasehold Improvements	(33,324)	(31,300)	(18,439)
Proceeds from Sale of Business	0	34,354	0
Net Cash Provided by (Used in) Investing Activities	(212,566)	(54,641)	(46,201)
Cash Flows From Financing Activities
Issuance of Noncontrolling Interests	1,165	110	885
Distributions to Noncontrolling Interests	(41,413)	(36,374)	(38,154)
Payments Under Tax Receivable Agreement	(13,345)	(12,381)	(12,039)
Cash Paid for Deferred and Contingent Consideration	0	0	(5,050)
Short-Term Borrowings	30,000	30,000	50,000
Repayment of Short-Term Borrowings	(30,000)	(30,000)	(50,000)
Repayment of Subordinated Borrowings	(6,799)	(9,751)	(6,000)
Payment of Notes Payable - Mizuho	0	0	(120,000)
Issuance of Notes Payable	0	0	170,000
Debt Issuance Costs	0	0	(2,084)
Purchase of Treasury Stock and Noncontrolling Interests	(315,233)	(304,313)	(173,958)
Dividends - Class A Stockholders	(77,302)	(56,521)	(51,558)
Net Cash Provided by (Used in) Financing Activities	(452,927)	(419,230)	(237,958)
Effect of Exchange Rate Changes on Cash	(1,370)	8,383	(25,347)
Net Increase in Cash, Cash Equivalents and Restricted Cash	182,711	41,748	112,380
Cash, Cash Equivalents and Restricted Cash-Beginning of Period	617,385	575,637	463,257
Cash, Cash Equivalents and Restricted Cash-End of Period	800,096	617,385	575,637
SUPPLEMENTAL CASH FLOW DISCLOSURE
Payments for Interest	17,818	19,471	14,074
Payments for Income Taxes	86,232	128,689	106,126
Accrued Dividends	12,288	9,815	7,836
Settlement of Contingent Consideration	0	10,780	0
Evercore Trust Company [Member]
SUPPLEMENTAL CASH FLOW DISCLOSURE
Assets Deconsolidated	0	81	0
Liabilities Deconsolidated	0	1,489	0
Decrease in Goodwill	0	28,442	0
Glisco [Member]
SUPPLEMENTAL CASH FLOW DISCLOSURE
Assets Deconsolidated	0	0	8,302
Liabilities Deconsolidated	0	0	2,343
GCP III [Member]
SUPPLEMENTAL CASH FLOW DISCLOSURE
Decrease in Noncontrolling Interest	$ 0	$ 0	$ 5,808