Share-Based and Other Deferred Compensation (Details) $ / shares in Units, $ in Thousands					1 Months Ended				3 Months Ended			6 Months Ended		12 Months Ended
	Mar. 01, 2021 USD ($)	Mar. 01, 2020 USD ($)	Feb. 15, 2020 shares	Mar. 01, 2019 USD ($)	Jun. 30, 2019 shares	Nov. 30, 2017 shares	Jul. 31, 2017 vote shares	Nov. 30, 2016 USD ($) tranche Number_Of_Anniversaries shares	Jun. 30, 2021 USD ($) shares	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($) shares	Jun. 30, 2021 USD ($) Installments $ / shares shares	Jun. 30, 2020 USD ($) shares	Dec. 31, 2020 shares	Dec. 31, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued LP Units (in shares) | shares									0		0	0	0
Headcount Reductions (as a percent)														8.00%
Severance Costs												$ 1,053	$ 22,816
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units Related to Restructuring | shares												29,000	104,000
Special Charges [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs											$ 1,806		$ 7,335
Special Charges [Member] | Cash and Deferred Cash Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs											6,385		22,816
Employee Compensation and Benefits | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs									$ 1,663			$ 1,948
LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited Partnership Units Convertible Conversion Ratio								1	1			1
Amended Two Thousand Sixteen Stock Incentive Plan [Member] | Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Additional Shares Authorized (in shares) | shares														6,000,000
Number of Shares Available for Grant (in shares) | shares									5,124,000			5,124,000
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense									$ 8,209		$ 2,989	$ 13,102	$ (3,821)
Deferred Compensation Arrangement with Individual, Distribution Paid										$ 48,461
Long Term Incentive Plan [Member] | Current Liabilities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Recorded Liability									48,455			48,455
Long Term Incentive Plan [Member] | Noncurrent Liabilities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Recorded Liability									$ 35,405			$ 35,405
Class J LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited Partners' Capital Account, Units Outstanding | shares									0		0	0	0
Class J LP Units [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Vested During Period (in shares) | shares			223,000
Limited Partners' Capital Account, Units Outstanding | shares									0			0
Issued LP Units (in shares) | shares									0			0
Class I-P Units [Member] | Board of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense									$ 1,130		$ 1,152	$ 2,366	$ 2,303
Grant of I-P Units (in units) | shares								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) | shares								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									$ 1,881		1,233	$ 3,741	2,326
Grant of K-P Units (in units) | shares					220,000	64,000
K-P Units to be Granted Upon Achievement of Benchmarks (in units) | shares									460,000
Grant of K-P Units, Fair Value of Award									$ 34,684
Class K Units Probable of Achievement (in units) | shares									403,000
Class K-P Units [Member] | Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of K-P Units (in units) | shares					120,000
Class K-P Units [Member] | Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of K-P Units (in units) | shares					100,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period												4 years
Restricted Stock Units (RSUs) [Member] | Amended Two Thousand Sixteen Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Issued During Period (in shares) | shares												2,028,000
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares												$ 118.63
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested									$ 240,568			$ 240,568
Restricted Stock Units (RSUs) [Member] | Amended Two Thousand Sixteen 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												$ 111.03
Restricted Stock Units (RSUs) [Member] | Amended Two Thousand Sixteen 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												$ 141.07
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									58,054		50,176	$ 109,762	100,472
Shares Vested During Period (in shares) | shares												2,142,000
Shares Forfeited During Period (in shares) | shares												106,000
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										$ 96,511
Deferred Compensation Arrangement Compensation Expense									34,858		35,626	$ 65,747	57,861
Deferred Compensation Arrangement with Individual, Recorded Liability									326,219			326,219
Deferred Compensation Arrangement with Individual, Compensation Cost Not Yet Recognized									225,591			$ 225,591
Deferred Compensation Arrangement With Individual, Total Compensation Cost Not Yet Recognized Period For Recognition												27 months
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	$ 6,000
Deferred Compensation Arrangement With Individual Cash Award Tranche Three Vesting Amount								$ 6,000
Awards Vesting Period | Number_Of_Anniversaries								2
Restricted Cash Award [Member] | Board of Directors Chairman [Member] | Minimum [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] | Board of Directors Chairman [Member] | Maximum [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															$ 29,500
Deferred Compensation Arrangement Compensation Expense									2,180		3,808	$ 5,521	7,153
Deferred Compensation Arrangement with Individual, Number of Installments | Installments												5
Employee Loans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense									6,296		$ 3,980	$ 10,446	8,415
Deferred Compensation Arrangement with Individual, Recorded Liability									25,356			$ 25,356
Employee Loans [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite Service Period (in years)												1 year
Employee Loans [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite Service Period (in years)												5 years
2017 Long-term Incentive Plan [Member] | Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Cost Not Yet Recognized									17,133			$ 17,133
Long Term Incentive Plan Performance Period (in years)												4 years
2021 Long Term Incentive Plan | Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Cost Not Yet Recognized									$ 125,984			$ 125,984
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) | shares							4,148,000
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 | shares							1
Evercore ISI [Member] | Class J LP Units [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense													$ 1,067
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) | shares							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) | shares							963,000
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) | shares							938,000