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, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 132,504 $ 116,398
Proved properties 101,459 90,869
Unproved properties 10,204 13,000
Accumulated depreciation and depletion (1,924) (542)
Total property, plant and equipment, net 130,580 115,856
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 13,276 9,491
Wells in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 4,660 345
Corporate and other    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 2,905 $ 2,693