Share-Based and Other Deferred Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended			12 Months Ended					35 Months Ended
	Nov. 30, 2017 USD ($) shares	Jul. 31, 2017 USD ($) vote shares	Nov. 30, 2016 USD ($) tranche shares	Mar. 31, 2018 USD ($) shares	Mar. 31, 2017 USD ($) shares	Jun. 30, 2013 shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) payment_installment $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 shares	Feb. 15, 2020 shares	Dec. 31, 2012 USD ($)	Dec. 31, 2006 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense | $								$ 24,677	$ 15,504	$ 1,476
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $								53,402	44,209	36,755
Adjustments to Additional Paid-In-Capital | $								44,729	16,242
Severance Costs | $								6,655	6,820	6,766
Cash Payments Related to Separation Benefits | $								2,914	3,622	3,805
Special Charges | $								25,437	$ 8,100	41,144
Special Charges [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs | $										1,863
Atalanta Sosnoff [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Adjustments to Additional Paid-In-Capital | $										6,333
Atalanta Sosnoff [Member] | Special Charges [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of Profits Interests Charge | $										6,333
Evercore Trust Company [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Special Charges | $								$ 3,930
LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited Partnership Units Convertible Conversion Ratio			1					1
2006 Stock Incentive Plan [Member] | Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Authorized														20,000,000
Number of Additional Shares Authorized						5,000,000
2006 and 2016 Stock Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Issued During Period (in shares)								2,813,000
Shares Vested During Period (in shares)								2,512,000
Shares Forfeited During Period (in shares)								154,000
2016 Stock Incentive Plan [Member] | Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Additional Shares Authorized									10,000,000
Number of Shares Available for Grant								7,247,000	9,906,000
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense | $								$ 31,923	$ 35,258	6,192
Long Term Incentive Plan Performance Period (in years)								4 years
Deferred Compensation Arrangement with Individual, Recorded Liability | $								$ 47,299
Number of Payment Installments | payment_installment								3
Deferred Compensation Arrangement with Individual, Distribution Paid | $								$ 34,157
Long Term Incentive Plan [Member] | Second Installment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Distribution Paid | $								$ 14,756
Class G LP Interests [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Management Basis EBIT Margin (as a percent)								12.00%
Class G LP Interests [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Management Basis EBIT Margin (as a percent)								16.00%
Class H LP Interests [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class H Interests Performance Period (in years)								3 years
Class H LP Interests [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Management Basis EBIT Margin (as a percent)								7.00%
Management Basis EBIT | $								$ 8,000
Class H LP Interests [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Management Basis EBIT Margin (as a percent)								17.00%
Management Basis EBIT | $								$ 48,000
Class I-P Units [Member] | Board of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense | $								4,619	$ 544
Grant of I-P Units (in units)			400,000
Retirement Notice Requirement			1 year
Number of Tranches of Class I-P Units | tranche			2
Number of Class I-P Units in Each Tranche (in units)			200,000
Number of Consecutive Trading Days Required for Class I-P Units to Exceed Thresholds			20 days
Grant of I-P Units, Fair Value of Award | $			$ 24,412
Class K-P Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense | $								197
Limited Partnership Units Convertible Conversion Ratio	1
Grant of K-P Units (in units)	64,000
K-P Units to be Granted Upon Achievement of Benchmarks (in units)	16,000
Grant of K-P Units, Fair Value of Award | $	$ 5,000
LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested Awards, Compensation Not yet Recognized | $								$ 53,527
Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition								31 months
Restricted Stock Units (RSUs) [Member] | Board of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Issued During Period (in shares)									900,000
Restricted Stock Units (RSUs) [Member] | Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested and Expected to Vest, Outstanding, Number (in shares)								114,000
Restricted Stock Units (RSUs) [Member] | 2006 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense | $										$ 105,496
Shares Issued During Period (in shares)										2,712,000
Shares Vested During Period (in shares)										2,259,000
Shares Forfeited During Period (in shares)										167,000
Restricted Stock Units (RSUs) [Member] | 2006 Stock Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares										$ 48.41
Restricted Stock Units (RSUs) [Member] | 2006 Stock Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares										$ 58.47
Restricted Stock Units (RSUs) [Member] | 2006 and 2016 Stock Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense | $								$ 156,353	$ 125,990
Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition								30 months
Shares Issued During Period (in shares)									3,144,000
Shares Vested During Period (in shares)								2,512,000	2,609,000
Shares Forfeited During Period (in shares)								154,000	181,000
Restricted Stock Units (RSUs) [Member] | 2006 and 2016 Stock Incentive Plans [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares									$ 44.30
Restricted Stock Units (RSUs) [Member] | 2006 and 2016 Stock Incentive Plans [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares									$ 70.65
Restricted Stock Units (RSUs) [Member] | 2016 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested Awards, Compensation Not yet Recognized | $								$ 258,804
Shares Issued During Period (in shares)								2,813,000
Restricted Stock Units (RSUs) [Member] | 2016 Stock Incentive Plan [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Issued During Period (in shares)				1,800,000
Awards Vesting Period				4 years
Restricted Stock Units (RSUs) [Member] | 2016 Stock Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares								$ 69.10
Restricted Stock Units (RSUs) [Member] | 2016 Stock Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares								$ 85.68
Deferred Cash Compensation Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation, Vesting Period (in years)								4 years
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount | $								$ 3,750	$ 41,147				$ 3,926
Deferred Compensation Arrangement with Individual, Compensation Cost Not Yet Recognized | $								$ 76,271
Deferred Compensation Arrangement With Individual, Total Compensation Cost Not Yet Recognized Period For Recognition								43 months
Deferred Cash Compensation Program [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation, Vesting Period (in years)				4 years
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount | $				$ 83,000
Restricted Cash Award [Member] | Board of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Retirement Notice Requirement			6 months
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount | $			$ 35,000
Deferred Compensation Arrangement With Individual Cash Award Tranche One Vesting Amount | $			11,000
Deferred Compensation Arrangement With Individual Cash Award Tranche Two Vesting Amount | $			$ 6,000
Awards Vesting Period			4 years
Restricted Cash Award [Member] | Minimum [Member] | Board of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount | $			$ 8,750
Restricted Cash Award [Member] | Maximum [Member] | Board of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount | $			$ 35,000
Other Deferred Cash [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount | $		$ 27,500
Awards Vesting Period		5 years
Employee Loans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense | $								$ 20,969	$ 19,625	$ 14,564
Deferred Compensation Arrangement with Individual, Recorded Liability | $								$ 37,084
Requisite Service Period (in years)								1 year
Maximum Contractual Term (in years)								5 years
Evercore ISI [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Management Basis EBIT Margin (as a percent)								11.70%	16.10%	15.20%
Management Basis EBIT | $								$ 26,904	$ 39,634	$ 34,395
Evercore ISI [Member] | Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Management Basis EBIT Margin (as a percent)							14.00%
Management Basis EBIT | $							$ 34,357
Evercore ISI [Member] | Class E LP Units [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units Amended In Period (in units)					19,000
Shares Issued During Period (in shares)								20,000
Shares Vested During Period (in shares)								387,000
Shares Forfeited During Period (in shares)								14,000
Evercore ISI [Member] | Class E LP Units [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense | $								$ 17,962	21,077	21,425
Evercore ISI [Member] | Class G LP Interests [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units Amended In Period (in units)					14,000
Shares Issued During Period (in shares)								9,000
Shares Vested During Period (in shares)								355,000
Shares Forfeited During Period (in shares)								365,000
Evercore ISI [Member] | Class H LP Interests [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Units Outstanding (in units)		4,148,000
Units Amended In Period (in units)					162,000
Shares Issued During Period (in shares)								10,000
Shares Vested During Period (in shares)								0
Shares Forfeited During Period (in shares)								10,000
Evercore ISI [Member] | Class H LP Interests [Member] | Acquisition Related [Member] | Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Interests That Would Vest Related To Acquisition Related Awards Based On Current Performance (in units)												2,005,000
Evercore ISI [Member] | Class J LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Number of Votes | vote		1
Evercore ISI [Member] | Class J LP Units [Member] | Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues		1
Evercore ISI [Member] | Class J LP Units [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Issued During Period (in shares)								41,000
Shares Vested During Period (in shares)								0
Shares Forfeited During Period (in shares)								41,000
Evercore ISI [Member] | Class J LP Units [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense | $								$ 6,020
Evercore ISI [Member] | Class G And H Interests [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense | $								(12,897)	$ 59,357	$ 61,111
Evercore ISI [Member] | Vested LP Units [Member] | Class E LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units)											710,000
Evercore ISI [Member] | Vested LP Units [Member] | Class G LP Interests [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units)											538,000
Evercore ISI [Member] | Vested LP Units [Member] | Class H LP Interests [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units)											2,044,000
Evercore ISI [Member] | Vested LP Units [Member] | Class J LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units)		1,012,000
Evercore ISI [Member] | Vested LP Units [Member] | Class J LP Units [Member] | Subject to Continued Employment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units)		963,000
Evercore ISI [Member] | Unvested LP Units [Member] | Class E LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units)											710,000
Evercore ISI [Member] | Unvested LP Units [Member] | Class G LP Interests [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units)											540,000
Evercore ISI [Member] | Unvested LP Units [Member] | Class H LP Interests [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units)											2,051,000
Evercore ISI [Member] | Unvested LP Units [Member] | Class J LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units)		938,000
Evercore ISI [Member] | Modified LP Units and Interests [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense | $								$ 3,532
Amended Grant Date Weighted Average Fair Value, Granted | $					$ 14,891