Noncontrolling Interest - Summary of Changes in Noncontrolling Interest (Details)	9 Months Ended
	Sep. 30, 2021 shares	Dec. 31, 2020
Class A Common Stock
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Outstanding, beginning balance (in shares)	30,343,421
Outstanding, ending balance (in shares)	50,692,057
Earthstone Energy Holdings, LLC
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Outstanding, beginning balance (in shares)	65,352,792
Outstanding, ending balance (in shares)	85,046,052
Earthstone Energy Holdings, LLC | Restricted Stock Units And Performance Units
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
EEH Units issued in connection with the vesting of restricted stock units and performance-based units (in shares)	773,666
Earthstone Energy Holdings, LLC | Class A Common Stock
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
EEH units and class B common stock converted to class A common stock (in shares)	0
Earthstone Energy Holdings, LLC | IRM Acquisition
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
EEH Units issued in connect with Acquisition (in shares)	12,719,594
Earthstone Energy Holdings, LLC | Tracker/Sequel Acquisition
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
EEH Units issued in connect with Acquisition (in shares)	6,200,000
EEH Units Held By Earthstone and Lynden US | Earthstone Energy Holdings, LLC
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Outstanding, beginning balance (in shares)	30,343,421
Outstanding, ending balance (in shares)	50,692,057
EEH Units Held By Earthstone and Lynden US | Earthstone Energy Holdings, LLC | Restricted Stock Units And Performance Units
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
EEH Units issued in connection with the vesting of restricted stock units and performance-based units (in shares)	773,666
EEH Units Held By Earthstone and Lynden US | Earthstone Energy Holdings, LLC | Class A Common Stock
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
EEH units and class B common stock converted to class A common stock (in shares)	655,376
EEH Units Held By Earthstone and Lynden US | Earthstone Energy Holdings, LLC | IRM Acquisition
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
EEH Units issued in connect with Acquisition (in shares)	12,719,594
EEH Units Held By Earthstone and Lynden US | Earthstone Energy Holdings, LLC | Tracker/Sequel Acquisition
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
EEH Units issued in connect with Acquisition (in shares)	6,200,000
EEH Units Held By Earthstone and Lynden US | Earthstone Energy Holdings, LLC
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Percentage of EEH Units Held By Earthstone and Lynden	59.60%	46.40%
EEH Units Held By Others | Earthstone Energy Holdings, LLC
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Outstanding, beginning balance (in shares)	35,009,371
Outstanding, ending balance (in shares)	34,353,995
EEH Units Held By Others | Earthstone Energy Holdings, LLC | Restricted Stock Units And Performance Units
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
EEH Units issued in connection with the vesting of restricted stock units and performance-based units (in shares)	0
EEH Units Held By Others | Earthstone Energy Holdings, LLC | Class A Common Stock
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
EEH units and class B common stock converted to class A common stock (in shares)	(655,376)
EEH Units Held By Others | Earthstone Energy Holdings, LLC | IRM Acquisition
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
EEH Units issued in connect with Acquisition (in shares)	0
EEH Units Held By Others | Earthstone Energy Holdings, LLC | Tracker/Sequel Acquisition
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
EEH Units issued in connect with Acquisition (in shares)	0
EEH Units Held By Others | Earthstone Energy Holdings, LLC
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Percentage of EEH Units Held By Others	40.40%	53.60%