Net (Loss) Income 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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				348,224
Net (loss) income attributable to Earthstone Energy, Inc.	$ (16,339)	$ 8,777	$ 369	$ (8,427)
Net (loss) income per common share attributable to Earthstone Energy, Inc.:
Basic (in dollars per share)	$ (0.55)	$ 0.30	$ 0.01	$ (0.29)
Diluted (in dollars per share)	$ (0.55)	$ 0.30	$ 0.01	$ (0.29)
Weighted average common shares outstanding
Basic (in shares)	29,858,162	28,895,893	29,677,795	28,808,205
Add potentially dilutive securities:
Unvested restricted stock units (in shares)	0	0	0	0
Unvested performance units (in shares)	0	332,993	0	0
Diluted weighted average common shares outstanding (in shares)	29,858,162	29,228,886	29,677,795	28,808,205