Annual report pursuant to Section 13 and 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
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 116,398 $ 11,062
Accumulated depreciation and depletion (542) (69)
Total property, plant and equipment, net 115,856 10,993
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 9,491 9,491
Proved oil and natural gas properties    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 90,869 0
Unproved oil and natural gas properties    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 13,000 0
Wells in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 345 0
Corporate and other    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 2,693 $ 1,571