Share-Based and Other Deferred Compensation (Details) $ / shares in Units, $ in Thousands		1 Months Ended				3 Months Ended			6 Months Ended		12 Months Ended
	Feb. 15, 2020 shares	Jun. 30, 2019 USD ($) shares	Nov. 30, 2017 USD ($) shares	Jul. 31, 2017 vote shares	Nov. 30, 2016 USD ($) tranche Number_Of_Anniversaries shares	Jun. 30, 2020 USD ($) shares	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) payment_installment Installments $ / shares shares	Jun. 30, 2019 USD ($)	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued LP Units (in shares) | shares						0			0
Limited Partners' Capital Account, Units Outstanding | shares						0			0
Deferred Compensation Arrangement with Individual, Compensation Cost Not Yet Recognized						$ 214,338			$ 214,338
Deferred Compensation Arrangement With Individual, Total Compensation Cost Not Yet Recognized Period For Recognition									34 months
Deferred Compensation Arrangement Compensation Expense						$ 39,434		$ 25,375	$ 65,014	$ 52,768
Headcount Reductions (as a percent)						6.00%			6.00%
Severance Costs								1,538	$ 22,816	4,813
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs								218		1,220
Restricted Stock Units (RSUs) [Member] | Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units Related to Restructuring | shares											126,000
Cash and Deferred Cash Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs								1,320		3,593
Special Charges [Member] | Separation Benefits and Stay Arrangements [Member] | Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs											$ 26,215
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			$ 1,272
Special Charges [Member] | Restricted Stock Units (RSUs) [Member] | Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs											8,944
Special Charges [Member] | Deferred Compensation [Member] | Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs											$ 11,631
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			$ 1,578
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						7,022,000			7,022,000
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense						$ 2,989	$ (6,810)	8,216	$ (3,821)	16,626
Long Term Incentive Plan Performance Period (in years)									4 years
Number of Payment Installments | payment_installment									3
Deferred Compensation Arrangement with Individual, Distribution Paid										19,516
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						31,146			$ 31,146
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						62,293			62,293
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
Class I-P Units [Member] | Board of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense						1,152		1,152	2,303	2,291
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						1,233		338	$ 2,326	634
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			16,000
Grant of K-P Units, Fair Value of Award		$ 14,240	$ 6,250
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]
Deferred Compensation, Vesting Period (in years)									4 years
Restricted Stock Units (RSUs) [Member] | 2016 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Issued During Period (in shares) | shares									1,926,000
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares									$ 81.18
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grant Date Weighted Average Fair Value, Granted									$ 156,319
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									$ 44.21
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									$ 81.53
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						50,176		56,526	$ 100,472	112,144
Shares Vested During Period (in shares) | shares									2,465,000
Shares Forfeited During Period (in shares) | shares									75,000
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							$ 179,705
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
Deferred Compensation Arrangement With Individual Cash Award Tranche Three Vesting Amount					$ 6,000
Awards Vesting Period | Number_Of_Anniversaries					3
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
Awards Vesting Period | Installments									5
Long Term Incentive Plan [Member] | 2017 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						36,613			$ 36,613
Employee Loans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense						3,980		5,741	8,415	9,346
Deferred Compensation Arrangement with Individual, Recorded Liability						$ 35,572			$ 35,572
Requisite Service Period (in years)									1 year
Maximum Contractual Term (in years)									5 years
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								$ 3,700	$ 1,067	$ 7,749
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