Subsequent Events (Details) - USD ($) shares in Millions		3 Months Ended
	May 01, 2017	Mar. 31, 2017	Mar. 31, 2016	Mar. 30, 2017	Dec. 31, 2016	Sep. 19, 2016	Sep. 18, 2016	Jun. 05, 2015
Subsequent Event [Line Items]
Proceeds from stock option exercises		$ 542,000	$ 25,000
Evolent Health LLC
Subsequent Event [Line Items]
Parent's ownership percentage		83.90%		77.40%	77.40%	74.60%	71.00%	70.30%
Subsequent Event
Subsequent Event [Line Items]
Proceeds from stock option exercises	$ 0
Subsequent Event | Evolent Health LLC
Subsequent Event [Line Items]
Parent's ownership percentage	84.90%
Subsequent Event | Over-Allotment Option | Class A
Subsequent Event [Line Items]
Number of shares issued (in shares)	1.1
Subsequent Event | Over-Allotment Option | Class A | Investor Stockholders
Subsequent Event [Line Items]
Number of shares issued (in shares)	0.5
Subsequent Event | Over-Allotment Option | Class A | Class A Common Stock Pursuant To Class B Exchanges | Investor Stockholders
Subsequent Event [Line Items]
Number of shares issued (in shares)	0.6