Acquisitions - Consideration Transferred (Details) - USD ($) $ / shares in Units, $ in Thousands	Jan. 07, 2021	Jun. 30, 2021
Fair value of liabilities assumed:
Other current liabilities		$ 5,985
IRM Acquisition
Business Acquisition [Line Items]
Cash consideration	$ 137,302
Total consideration transferred	213,874
Fair value of assets acquired:
Cash		2,992
Other current assets		10,925
Oil and gas properties		226,148
Other non-current assets		258
Amount attributable to assets acquired		240,323
Fair value of liabilities assumed:
Derivative liability - current		10,177
Asset retirement obligation - noncurrent		10,287
Amount attributable to liabilities assumed		$ 26,449
Net cash consideration	134,300
Cash consideration	$ 137,302
IRM Acquisition | Class A Common Stock
Business Acquisition [Line Items]
Shares of earthstone Class A common stock issued (in shares)	12,719,594
Earthstone Class A Common Stock price as of January 7, 2021 (in dollars per share)	$ 6.02
Class A Common Stock consideration	$ 76,572
Cash consideration	137,300
Fair value of liabilities assumed:
Net cash consideration	134,300
Cash consideration	137,300
Cash acquired	$ 3,000