Share-Based and Other Deferred Compensation (Details) $ / shares in Units, $ in Thousands		1 Months Ended			3 Months Ended		12 Months Ended
	Feb. 15, 2019 shares	Nov. 30, 2017 USD ($) shares	Jul. 31, 2017 vote shares	Nov. 30, 2016 USD ($) tranche shares	Mar. 31, 2019 USD ($) payment_installment $ / shares shares	Mar. 31, 2018 USD ($) shares	Dec. 31, 2016 shares	Dec. 31, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense					$ 27,393	$ 12,591
Severance Costs					3,275	3,418
Cash Payments Related to Separation Benefits					$ 1,724	$ 2,875
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					2,901,000	5,484,000
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense					$ 8,410	$ 7,127
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	4,532
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					73,823
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	632,000
Class I-P Units [Member] | Board of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense					1,139	1,139
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					$ 296	296
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] | 2016 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Issued During Period (in shares) | shares					2,467,000
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares					$ 90.11
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
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					$ 93.53
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					$ 55,618	42,731
Shares Vested During Period (in shares) | shares					2,298,000
Shares Forfeited During Period (in shares) | shares					19,000
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					$ 93,366
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
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					$ 86,170
Employee Loans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense					3,605	3,322
Deferred Compensation Arrangement with Individual, Recorded Liability					$ 36,357
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					$ 4,049	$ 3,872
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