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Property and Equipment - Components of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties, at cost $ 526,306 $ 514,821
Less: Accumulated depletion and depreciation (314,717) (291,152)
Oil and Gas Properties, Net 211,589 223,669
Field and office equipment 27,533 27,252
Less: Accumulated depreciation (20,700) (20,496)
Field and Office Equipment, Net 6,833 6,756
Total Property and Equipment, Net $ 218,422 $ 230,425