Net Income Per Common Share - Reconciliation of Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income (loss) attributable to Earthstone Energy, Inc.	$ 5,321	$ 729
Net income per common share attributable to Earthstone Energy, Inc.:
Basic (in dollars per share)	$ 0.19	$ 0.03
Diluted (in dollars per share)	$ 0.19	$ 0.03
Weighted average common shares outstanding
Basic (in shares)	27,783,805	22,276,996
Add potentially dilutive securities:
Unvested restricted stock units (in shares)	128,119	308,478
Diluted weighted average common shares outstanding (in shares)	27,911,924	22,585,474