Stock-Based Compensation - Schedule of Target Multipliers (Details) - Performance Stock Units	9 Months Ended
	Sep. 30, 2021
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earthstone’s Annualized TSR	7.70%
20.5% or greater | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earthstone’s Annualized TSR	20.50%
20.5% or greater | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
TSR Multiplier	200.00%
0.145 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earthstone’s Annualized TSR	14.50%
0.145 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
TSR Multiplier	100.00%
7.7% | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earthstone’s Annualized TSR	7.70%
7.7% | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
TSR Multiplier	50.00%
Less than 7.7% | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
TSR Multiplier	0.00%