Evercore Inc. (Parent Company Only) Financial Statements - Condensed Statements of Cash Flow (Parent Company Only) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ (1,399)	$ 60,082	$ 25,877	$ 94,647	$ 59,958	$ 47,283	$ 33,593	$ 7,678	$ 179,207	$ 148,512	$ 57,690
Adjustment to Tax Receivable Agreement									(77,535)	0	0
Deferred Taxes									148,320	10,043	(3,627)
Other Assets									(11,667)	(33,080)	(3,903)
Taxes Payable									(10,849)	9,097	28,670
Net Cash Provided by Operating Activities									516,551	421,569	367,671
CASH FLOWS FROM INVESTING ACTIVITIES
Net Cash Provided by (Used in) Investing Activities									(54,641)	(48,504)	(26,117)
CASH FLOWS FROM FINANCING ACTIVITIES
Payment of Notes Payable - Mizuho									0	(120,000)	0
Issuance of Notes Payable									0	170,000	0
Dividends									(56,521)	(51,558)	(46,132)
Net Cash Provided by (Used in) Financing Activities									(419,230)	(237,958)	(234,623)
Net Increase in Cash and Cash Equivalents									51,063	109,760	96,604
Cash and Cash Equivalents-Beginning of Period				558,524				448,764	558,524	448,764	352,160
Cash and Cash Equivalents-End of Period	609,587				558,524				609,587	558,524	448,764
SUPPLEMENTAL CASH FLOW DISCLOSURE
Accrued Dividends									9,815	7,836	6,514
Exchange of Notes Payable as Consideration for Exercise of Warrants									0	0	118,347
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income									125,454	107,528	42,863
Undistributed Income of Subsidiary									(209,905)	(209,841)	(103,931)
Adjustment to Tax Receivable Agreement									(77,535)	0	0
Deferred Taxes									153,344	12,453	(1,685)
Accretion on Long-term Debt									250	180	1,603
Other Assets									(9,689)	0	3,402
Taxes Payable									(21,341)	6,580	14,761
Net Cash Provided by Operating Activities									(39,422)	(83,100)	(42,987)
CASH FLOWS FROM INVESTING ACTIVITIES
Investment in Subsidiary									95,943	84,658	82,703
Net Cash Provided by (Used in) Investing Activities									95,943	84,658	82,703
CASH FLOWS FROM FINANCING ACTIVITIES
Exercise of Warrants, Net									0	0	6,416
Payment of Notes Payable - Mizuho									0	(120,000)	0
Issuance of Notes Payable									0	170,000	0
Dividends									(56,521)	(51,558)	(46,132)
Net Cash Provided by (Used in) Financing Activities									(56,521)	(1,558)	(39,716)
Net Increase in Cash and Cash Equivalents									0	0	0
Cash and Cash Equivalents-Beginning of Period				$ 0				$ 0	0	0	0
Cash and Cash Equivalents-End of Period	$ 0				$ 0				0	0	0
SUPPLEMENTAL CASH FLOW DISCLOSURE
Accrued Dividends									9,815	7,836	6,514
Exchange of Notes Payable as Consideration for Exercise of Warrants									$ 0	$ 0	$ 118,347