Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	$ 405	$ (988)
Effective tax rate	(1.80%)	0.60%
Income Tax Contingency [Line Items]
Tax receivables agreement, percent of tax savings to be paid	85.00%
Evolent Health LLC | Additional Paid-in Capital
Income Tax Contingency [Line Items]
Decrease in deferred tax liability related to the book basis compared to the tax basis of partnership interest	$ 2,800