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Property and Equipment - Components of Property and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties, at cost $ 522,239 $ 514,821
Less: Accumulated depletion and depreciation (306,116) (291,152)
Oil and Gas Properties, Net 216,123 223,669
Field and office equipment 28,188 27,252
Less: Accumulated depreciation (21,283) (20,496)
Field and office equipment, net 6,905 6,756
Total Property and Equipment, Net $ 223,028 $ 230,425