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
Sep. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 120,401 $ 116,398
Accumulated depreciation and depletion (1,402) (542)
Total property, plant and equipment, net 118,999 115,856
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 13,276 9,491
Proved oil and natural gas properties    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 88,349 90,869
Unproved oil and natural gas properties    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 10,000 13,000
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 6,511 345
Corporate and other    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 2,265 $ 2,693