Net Income (Loss) Per Common Share - Reconciliation of Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income (loss) attributable to Earthstone Energy, Inc.	$ 16,708	$ (17,204)
Net income (loss) per common share attributable to Earthstone Energy, Inc.:
Basic (in dollars per share)	$ 0.57	$ (0.60)
Diluted (in dollars per share)	$ 0.57	$ (0.60)
Weighted average common shares outstanding
Basic (in shares)	29,497,428	28,719,542
Add potentially dilutive securities:
Unvested restricted stock units (in shares)	0	0
Unvested performance units (in shares)	0	0
Diluted weighted average common shares outstanding (in shares)	29,497,428	28,719,542