Supplemental Financial Information (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Net Revenues	$ 540,031	$ 406,601	$ 370,470	$ 387,247	$ 445,369	$ 386,314	$ 350,656	$ 257,713	$ 1,704,349	$ 1,440,052	$ 1,223,273
Total Expenses	355,885	319,531	324,204	275,918	348,010	301,229	288,051	241,588	1,275,538	1,178,878	1,094,603
Income Before Income from Equity Method Investments and Income Taxes	184,146	87,070	46,266	111,329	97,359	85,085	62,605	16,125	428,811	261,174	128,670
Income from Equity Method Investments	3,331	1,827	2,070	1,610	2,512	1,178	1,664	1,287	8,838	6,641	6,050
Income Before Income Taxes	187,477	88,897	48,336	112,939	99,871	86,263	64,269	17,412	437,649	267,815	134,720
Provision for Income Taxes	188,876	28,815	22,459	18,292	39,913	38,980	30,676	9,734	258,442	119,303	77,030
Net Income	(1,399)	60,082	25,877	94,647	59,958	47,283	33,593	7,678	179,207	148,512	57,690
Net Income Attributable to Noncontrolling Interest	18,013	14,171	7,693	13,876	16,530	12,588	9,506	2,360	53,753	40,984	14,827
Net Income Attributable to Evercore Inc.	$ (19,412)	$ 45,911	$ 18,184	$ 80,771	$ 43,428	$ 34,695	$ 24,087	$ 5,318	$ 125,454	$ 107,528	$ 42,863
Net Income Per Share Attributable to Evercore Inc. Common Shareholders
Basic (in dollars per share)	$ (0.50)	$ 1.18	$ 0.45	$ 2.00	$ 1.11	$ 0.89	$ 0.61	$ 0.13	$ 3.16	$ 2.74	$ 1.15
Diluted (in dollars per share)	(0.50)	1.04	0.41	1.76	0.98	0.79	0.55	0.12	2.80	2.43	0.98
Dividends Declared per Share of Class A Common Stock (in dollars per share)	$ 0.40	$ 0.34	$ 0.34	$ 0.34	$ 0.34	$ 0.31	$ 0.31	$ 0.31	$ 1.42	$ 1.27	$ 1.15