Share-Based and Other Deferred Compensation (Details) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended			6 Months Ended		12 Months Ended				23 Months Ended
	Nov. 30, 2017 USD ($) shares	Jul. 31, 2017 vote shares	Nov. 30, 2016 USD ($) tranche shares	Jun. 30, 2018 USD ($) shares	Jun. 30, 2017 USD ($) shares	Mar. 31, 2017 USD ($) shares	Jun. 30, 2018 USD ($) payment_installment $ / shares shares	Jun. 30, 2017 USD ($) shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) shares	Dec. 31, 2014 shares	Feb. 15, 2020 shares	Mar. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense				$ 15,750	$ 5,423		$ 28,341	$ 9,820
Severance Costs				3,066	2,859		6,484	3,468
Cash Payments Related to Separation Benefits				$ 2,997	$ 2,235		$ 5,873	$ 2,346
LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited Partnership Units Convertible Conversion Ratio			1				1
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				5,399,000	7,423,000		5,399,000	7,423,000
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense				$ 6,948	$ 6,700		$ 14,075	$ 12,558
Long Term Incentive Plan Performance Period (in years)							4 years
Deferred Compensation Arrangement with Individual, Recorded Liability				56,222			$ 56,222
Number of Payment Installments | payment_installment							3
Deferred Compensation Arrangement with Individual, Distribution Paid								19,401
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							$ 4,532
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				1,152	1,152		2,291	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				299			595
Limited Partnership Units Convertible Conversion Ratio	1
Grant of K-P Units (in units) | shares	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	$ 5,000
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				46,375	41,825		$ 89,106	82,869
Shares Vested During Period (in shares) | shares							2,417,000
Shares Forfeited During Period (in shares) | shares							37,000
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							1,885,000
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							$ 86.23
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							$ 109.85
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			$ 82,592
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										$ 29,500
Awards Vesting Period										5 years
Employee Loans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense				4,787	4,857		$ 8,109	9,030
Deferred Compensation Arrangement with Individual, Recorded Liability				37,282			$ 37,282
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%
Management Basis EBIT										$ 26,904
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) | 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					5,682			10,438
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]
Number of Units Outstanding (in units) | shares		4,148,000
Units Amended In Period (in units) | shares						162,000
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) | shares													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 | 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			$ 7,572
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					11,324	$ (26,224)		(14,900)
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					$ 6,554			3,532
Amended Grant Date Weighted Average Fair Value, Granted								$ 14,891