Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows From Operating Activities
Net Income	$ 179,207	$ 148,512	$ 57,690
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Net (Gains) Losses on Investments, Marketable Securities and Contingent Consideration	(32)	1,124	5,517
Equity Method Investments	(513)	2,602	2,818
Equity-Based and Other Deferred Compensation	230,268	258,295	207,533
Impairment of Goodwill and Equity Method Investments	21,507	8,100	28,500
Gain on Sale of Institutional Trust and Independent Fiduciary business of ETC	(7,808)	0	0
Depreciation, Amortization and Accretion	26,032	25,223	29,636
Bad Debt Expense	2,579	2,261	1,314
Adjustment to Tax Receivable Agreement	(77,535)	0	0
Release of Cumulative Foreign Exchange Losses	16,266	0	0
Deferred Taxes	148,320	10,043	(3,627)
Decrease (Increase) in Operating Assets:
Marketable Securities	865	937	556
Financial Instruments Owned and Pledged as Collateral at Fair Value	35	18,249	46,018
Securities Purchased Under Agreements to Resell	2,642	(11,890)	4,726
Accounts Receivable	47,120	(64,522)	(46,442)
Receivable from Employees and Related Parties	(2,188)	5,934	(3,937)
Assets Segregated for Bank Regulatory Requirements	10,000	0	0
Other Assets	(11,667)	(33,080)	(3,903)
(Decrease) Increase in Operating Liabilities:
Accrued Compensation and Benefits	(25,892)	48,258	51,732
Accounts Payable and Accrued Expenses	1,149	(10,030)	5,418
Securities Sold Under Agreements to Repurchase	(2,701)	(6,387)	(50,803)
Payables to Employees and Related Parties	3,217	(1,581)	8,704
Taxes Payable	(10,849)	9,097	28,670
Other Liabilities	(33,471)	10,424	(2,449)
Net Cash Provided by Operating Activities	516,551	421,569	367,671
Cash Flows From Investing Activities
Investments Purchased	(997)	(2,047)	(819)
Distributions of Private Equity Investments	2,072	183	6,821
Marketable Securities:
Proceeds from Sales and Maturities	45,642	46,547	32,318
Purchases	(40,995)	(69,568)	(39,101)
Purchase of Certificates of Deposit	(63,417)	0	0
Cash Paid for Acquisitions and Deconsolidation of Cash, net of Cash Acquired	0	(2,877)	(5,647)
(Increase) Decrease in Restricted Cash	0	(2,303)	0
Loans Receivable	0	0	(3,500)
Purchase of Furniture, Equipment and Leasehold Improvements	(31,300)	(18,439)	(16,189)
Proceeds from Sale of Business	34,354	0	0
Net Cash Provided by (Used in) Investing Activities	(54,641)	(48,504)	(26,117)
Cash Flows From Financing Activities
Issuance of Noncontrolling Interests	110	885	594
Distributions to Noncontrolling Interests	(36,374)	(38,154)	(23,723)
Payments Under Tax Receivable Agreement	(12,381)	(12,039)	(11,045)
Cash Paid for Deferred and Contingent Consideration	0	(5,050)	0
Short-Term Borrowing	30,000	50,000	45,000
Repayment of Short-Term Borrowing	(30,000)	(50,000)	(45,000)
Exercise of Warrants, net	0	0	6,416
Repayment of Subordinated Borrowings	(9,751)	(6,000)	0
Payment of Notes Payable - Mizuho	0	(120,000)	0
Issuance of Notes Payable	0	170,000	0
Debt Issuance Costs	0	(2,084)	0
Purchase of Treasury Stock and Noncontrolling Interests	(304,313)	(173,958)	(160,733)
Dividends - Class A Stockholders	(56,521)	(51,558)	(46,132)
Net Cash Provided by (Used in) Financing Activities	(419,230)	(237,958)	(234,623)
Effect of Exchange Rate Changes on Cash	8,383	(25,347)	(10,327)
Net Increase in Cash and Cash Equivalents	51,063	109,760	96,604
Cash and Cash Equivalents-Beginning of Period	558,524	448,764	352,160
Cash and Cash Equivalents-End of Period	609,587	558,524	448,764
SUPPLEMENTAL CASH FLOW DISCLOSURE
Payments for Interest	19,471	14,074	16,035
Payments for Income Taxes	128,689	106,126	47,820
Accrued Dividends	9,815	7,836	6,514
Settlement of Contingent Consideration	10,780	0	0
Increase (Decrease) in Fair Value of Redeemable Noncontrolling Interest	0	0	(1,331)
Receipt of Securities in Settlement of Accounts Receivable	0	0	1,079
Exchange of Notes Payable as Consideration for Exercise of Warrants	0	0	118,347
Purchase of Treasury Stock in Exchange for Notes Issuance and Warrant Proceeds	0	0	123,673
Evercore Trust Company [Member]
SUPPLEMENTAL CASH FLOW DISCLOSURE
Assets Deconsolidated	81	0	0
Liabilities Deconsolidated	1,489	0	0
Decrease in Goodwill	28,442	0	0
Glisco [Member]
SUPPLEMENTAL CASH FLOW DISCLOSURE
Assets Deconsolidated	0	8,302	0
Liabilities Deconsolidated	0	2,343	0
GCP III [Member]
SUPPLEMENTAL CASH FLOW DISCLOSURE
Decrease in Noncontrolling Interest	0	5,808	0
Atalanta Sosnoff [Member]
SUPPLEMENTAL CASH FLOW DISCLOSURE
Assets Deconsolidated	0	0	2,053
Liabilities Deconsolidated	0	0	2,074
Decrease in Goodwill	0	0	27,274
Decrease in Noncontrolling Interest	0	0	16,090
Decrease in Redeemable Noncontrolling Interest from Atalanta Sosnoff Deconsolidation	0	0	2,683
Decrease in Intangible Assets from Atalanta Sosnoff Deconsolidation	$ 0	$ 0	$ 13,924