Net Income Per Common Share - Reconciliation of Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income (loss) attributable to Earthstone Energy, Inc.	$ 11,770	$ 224	$ 3,343	$ 6,195
Net income per common share attributable to Earthstone Energy, Inc.:
Basic (in dollars per share)	$ 0.41	$ 0.01	$ 0.12	$ 0.22
Diluted (in dollars per share)	$ 0.41	$ 0.01	$ 0.12	$ 0.22
Weighted average common shares outstanding
Basic (in shares)	29,032,842	28,257,376	28,883,907	28,011,298
Add potentially dilutive securities:
Unvested restricted stock units (in shares)	0	54,383	0	97,067
Unvested performance units (in shares)	0	0	0	0
Diluted weighted average common shares outstanding (in shares)	29,032,842	28,311,759	28,883,907	28,108,365