Quarterly report pursuant to Section 13 or 15(d)

Summary of Property and Equipment (Detail)

v3.10.0.1
Summary of Property and Equipment (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
$ / bbl
Sep. 30, 2017
USD ($)
$ / bbl
Dec. 31, 2017
USD ($)
Property, Plant and Equipment [Abstract]      
Proved Oil and Gas Property, Full Cost Method $ 864,426   $ 460,029
Unproved Oil and Gas Property, Full Cost Method 132,576   117,634
Oil and Gas Property, Full Cost Method, Gross 997,002   577,663
Other property and equipment 18,701   12,712
Total properties and equipment 1,015,703   590,375
Accumulated depreciation, depletion and amortization (156,937)   (61,316)
Property and equipment, net (successful efforts method) 858,766   529,059
Unproved Oil and Gas Property excluded 132,600   $ 117,600
Capitalized Exploratory Well Costs 18,700    
Undeveloped Leasehold Costs Transferred 11,400    
Capitalized Costs, Proved Properties 2,400 $ 1,600  
Interest Costs Capitalized $ 7,100 $ 100  
Amortization Expense Per Physical Unit of Production | $ / bbl 15.83 11.93