Share-Based and Other Deferred Compensation (Details) $ / shares in Units, $ in Thousands		1 Months Ended				3 Months Ended			12 Months Ended						23 Months Ended	24 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 ($) tranche Number_Of_Anniversaries shares	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) shares	Jun. 30, 2013 shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) payment_installment Installments $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 shares	Dec. 31, 2014 USD ($) shares	Feb. 15, 2020 shares	Dec. 31, 2019 USD ($) shares	Mar. 31, 2019 USD ($)	Dec. 31, 2006 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense										$ 93,201	$ 58,430	$ 24,677
Share-based Payment Arrangement, Expense, Tax Benefit										49,251	39,958	53,402
Severance Costs										8,145	9,420	6,655
Termination Costs Incurred										7,756
Payments for Restructuring										6,412
Cash Payments Related to Separation Benefits										6,035	8,565	2,914
Restructuring Reserve										1,151	505					$ 1,151
Special Charges [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs										2,850	$ 2,024	3,930
Payments for Restructuring										$ 377
LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited Partnership Units Convertible Conversion Ratio					1					1
Two Thousand Six Stock Incentive Plan [Member] | Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares																		20,000,000
Number of Additional Shares Authorized (in shares) | shares								5,000,000
2006 and 2016 Stock Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Vested During Period (in shares) | shares										2,473,000
Shares Issued During Period (in shares) | shares										2,598,000
Shares Forfeited During Period (in shares) | shares										121,000
2016 Stock Incentive Plan [Member] | Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Additional Shares Authorized (in shares) | shares													10,000,000
Number of Shares Available for Grant (in shares) | shares										2,872,000	5,349,000					2,872,000
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense										$ 31,931	$ 42,745	31,923
Long Term Incentive Plan Performance Period (in years)										4 years
Number of Payment Installments | payment_installment										3
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										$ 19,516	4,532	34,157
Long Term Incentive Plan [Member] | Other Noncurrent Liabilities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Recorded Liability										$ 97,353						$ 97,353
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 J LP Units [Member] | Acquisition Related [Member] | Subsequent Event [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 (Reversal of Expense)										$ 4,619	4,619	4,619
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 (Reversal of Expense)										$ 3,690	1,200	197
Limited Partnership Units Convertible Conversion Ratio										1
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		$ 14,386	$ 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
LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount										$ 25,958						$ 25,958
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition										14 months
Restricted Stock Units (RSUs) [Member] | Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | shares										82,000						82,000
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 (Reversal of Expense)										$ 208,786	$ 171,354	$ 156,353
Shares Vested During Period (in shares) | shares										2,473,000	2,523,000	2,512,000
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount										$ 266,086						$ 266,086
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition										23 months
Shares Forfeited During Period (in shares) | shares										121,000	70,000	154,000
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										2,598,000	1,968,000	2,813,000
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares										$ 91.04	$ 95.01	$ 78.32
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) | shares						1,900,000
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares						$ 81.53
Deferred Compensation, Vesting Period (in years)						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										72.11	81.84	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										$ 96.22	$ 114.80	$ 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											$ 82,592	$ 3,750					$ 93,366
Deferred Compensation Arrangement with Individual, Compensation Cost Not Yet Recognized										$ 127,242						127,242
Deferred Compensation Arrangement With Individual, Total Compensation Cost Not Yet Recognized Period For Recognition										25 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						$ 179,000
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 | Number_Of_Anniversaries					4
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												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										$ 60,441						60,441
Employee Loans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense										20,421	17,971	$ 20,969
Deferred Compensation Arrangement with Individual, Recorded Liability										$ 34,073						$ 34,073
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%				14.00%
Management Basis EBIT												$ 26,904				$ 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) | shares							19,000
Evercore ISI [Member] | Class E LP Units [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense (Reversal of Expense)												17,962
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) | shares							14,000
Evercore ISI [Member] | Class H LP Interests [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units Amended in Period (in units) | shares							162,000
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) | 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]
Shares Vested During Period (in shares) | shares										1,118,000
Shares Issued During Period (in shares) | shares										2,000
Shares Forfeited During Period (in shares) | shares										2,000
Evercore ISI [Member] | Class J LP Units [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense (Reversal of Expense)										$ 18,101	$ 15,054	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 (Reversal of Expense)							$ (26,224)					(12,897)
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) | shares														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) | shares														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) | shares														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) | 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 E LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units) | shares														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) | shares														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) | shares														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) | shares				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 (Reversal of Expense)												3,532
Amended Grant Date Weighted Average Fair Value, Granted												$ 14,891
Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Headcount Reductions (as a percent)						6.00%
Forecast [Member] | Special Charges [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs									$ 38,000
Forecast [Member] | Evercore ISI [Member] | Class H LP Interests [Member] | Acquisition Related [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 | shares															2,005,000
Employee Severance [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Termination Costs Incurred										1,967
Employee Severance [Member] | Restricted Stock Units (RSUs) [Member] | Special Charges [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Termination Costs Incurred										1,272
Employee Severance [Member] | Cash and Deferred Cash Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Termination Costs Incurred										6,178
Employee Severance [Member] | Cash and Deferred Cash Compensation [Member] | Special Charges [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Termination Costs Incurred										$ 1,578
Employee Severance [Member] | Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Headcount Reductions (as a percent)						6.00%
Employee Severance [Member] | Forecast [Member] | Special Charges [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs									$ 38,000