Share-Based and Other Deferred Compensation (Details) $ / shares in Units, $ in Thousands	1 Months Ended				3 Months Ended			5 Months Ended	9 Months Ended		12 Months Ended				32 Months Ended
	Jul. 31, 2017 USD ($) shares	Feb. 28, 2017 shares	Nov. 30, 2016 USD ($) shares	Feb. 29, 2016 shares	Sep. 30, 2017 USD ($) shares	Mar. 31, 2017 USD ($) shares	Sep. 30, 2016 USD ($)	Feb. 15, 2018 USD ($) shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) shares	Dec. 31, 2014 shares	Feb. 15, 2020 shares	Dec. 31, 2012 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense					$ 8,599		$ 4,281		$ 18,419	$ 11,399
Expense Related to Separation Benefits					953		845		4,421	4,068
Cash Payments Related to Separation Benefits					$ 54		617		$ 2,399	2,379
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]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | shares													10,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares					7,412,000				7,412,000
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense					$ 6,721		6,117		$ 19,279	13,595
Long Term Incentive Plan Performance Period (in years)									4 years
Deferred Compensation Arrangement with Individual, Recorded Liability					49,400				$ 49,400
Number of Payment Installments									3
Deferred Compensation Arrangement with Individual, Distributions Paid					19,401				$ 19,401
Class I-P Units [Member] | Board of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of I-P Units | shares			400,000
Retirement Notice Requirement			1 year
Number of Tranches of Class I-P Units			2
Number of Class I-P Units in Each Tranche | 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
Compensation Expense Related to Class I-P Units					1,164				$ 3,455
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									2,620,000
Restricted Stock Units (RSUs) [Member] | 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									2,424,000
Shares Forfeited During Period | shares									127,000
Compensation Expense Related to Service-based Award					38,124		29,505		$ 116,363	86,783
Restricted Stock Units (RSUs) [Member] | Minimum [Member] | 2016 Stock Incentive Plan [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] | Maximum [Member] | 2016 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares									$ 81.52
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				$ 3,750				$ 41,147			$ 3,926
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					5,021		4,246		14,050	$ 14,777
Deferred Compensation Arrangement with Individual, Recorded Liability					27,468				$ 27,468
Requisite Service Period (in years)									1 year
Maximum Contractual Term (in years)									5 years
Class G 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 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 Interests [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class H Interests Performance Period (in years)									3 years
Class H 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 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
Evercore ISI [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Management Basis EBIT Margin (as a percent)										15.90%
Management Basis EBIT										$ 37,960
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%	11.70%
Management Basis EBIT											$ 34,357	$ 26,904
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 Related to Acquisition Related Awards									3,532
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grant Date Weighted Average Fair Value, Granted						$ 14,891
Evercore ISI [Member] | Class E LP Units [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Modified in Period | 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 Related to Acquisition Related Awards					4,835		5,133		15,273	15,683
Evercore ISI [Member] | Class E LP Units [Member] | Vested 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] | Class E LP Units [Member] | Unvested 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] | Class G Interests [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Vested During Period (in shares) | shares		368,000		371,000
Share-based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Modified in Period | shares						14,000
Evercore ISI [Member] | Class G Interests [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional Compensation Expense Related to Acquisition Related Awards if Maximum Thresholds Were Probable					16,349
Evercore ISI [Member] | Class G Interests [Member] | Acquisition Related [Member] | Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Compensation Expense Related to Acquisition Related Awards if Maximum Thresholds Were Probable								$ 2,456
Interests That Would Vest Related to Acquisition Related Awards if Maximum Thresholds Were Probable | shares								366,000
Evercore ISI [Member] | Class G Interests [Member] | Vested LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units) | shares														538,000
Evercore ISI [Member] | Class G Interests [Member] | Unvested LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units) | shares														540,000
Evercore ISI [Member] | Class H Interests [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | shares	4,148,000
Share-based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Modified in Period | shares						162,000
Evercore ISI [Member] | Class H 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 | shares															2,005,000
Evercore ISI [Member] | Class H Interests [Member] | Vested LP Units [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] | Class H Interests [Member] | Unvested LP Units [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] | Class J LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Number of Votes	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 Related to Acquisition Related Awards					2,315				2,315
Evercore ISI [Member] | Class J LP Units [Member] | Vested 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] | Class J LP Units [Member] | Unvested 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] | Class G And H Interests [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense Related to Acquisition Related Awards					$ 2,003		$ 8,629		$ 12,897	$ 50,379