Net Income (Loss) Per Common Share - Reconciliation of Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income (loss) attributable to Earthstone Energy, Inc.	$ 8,777	$ 650	$ (8,427)	$ 5,971
Net income (loss) per common share attributable to Earthstone Energy, Inc.:
Basic (in dollars per share)	$ 0.30	$ 0.02	$ (0.29)	$ 0.21
Diluted (in dollars per share)	$ 0.30	$ 0.02	$ (0.29)	$ 0.21
Weighted average common shares outstanding
Basic (in shares)	28,895,893	27,987,509	28,808,205	27,886,220
Add potentially dilutive securities:
Unvested restricted stock units (in shares)	0	48,543	0	81,201
Unvested performance units (in shares)	332,993	0	0	0
Diluted weighted average common shares outstanding (in shares)	29,228,886	28,036,052	28,808,205	27,967,421