Net Income Per Common Share - Reconciliation of Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income attributable to Earthstone Energy, Inc.	$ 719	$ 42,325
Net income per common share attributable to Earthstone Energy, Inc.:
Basic (in dollars per share)	$ 0.02	$ 1.50
Diluted (in dollars per share)	$ 0.02	$ 1.50
Weighted average common shares outstanding
Basic (in shares)	28,983,354	28,153,885
Add potentially dilutive securities:
Unvested restricted stock units (in shares)	0	63,889
Unvested performance units (in shares)	377,531	0
Diluted weighted average common shares outstanding (in shares)	29,360,885	28,217,774