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Property and Equipment - Components of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties, at cost $ 531,475 $ 520,488
Less: Accumulated depletion and depreciation (354,978) (335,390)
Oil and gas properties, net 176,497 185,098
Field and office equipment 27,018 26,797
Less: Accumulated depreciation (21,244) (20,842)
Field and office equipment, net 5,774 5,955
Total Property and Equipment, Net $ 182,271 $ 191,053