Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment - Summary of Property, Plant and Equipment Comprised of Fixed Assets and Oil and Gas Properties (Detail)

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Property, Plant and Equipment - Summary of Property, Plant and Equipment Comprised of Fixed Assets and Oil and Gas Properties (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 151,366 $ 132,504
Accumulated depreciation and depletion (4,173) (1,924)
Total property, plant and equipment, net 147,193 130,580
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 13,878 13,276
Proved oil and natural gas properties    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 114,337 101,459
Unproved oil and natural gas properties    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 10,204 10,204
Wells in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 7,905 4,660
Corporate and other    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 5,042 $ 2,905