Net Income (Loss) Per Common Share - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) attributable to noncontrolling interest	$ (15,887,000)	$ 861,000
Dilutive effect on net loss per common share attributable to Earthstone Energy, Inc	0
Earthstone Energy, Inc. Equity
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) attributable to noncontrolling interest	$ (15,900,000)	$ 900,000
Class B Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001