Annual report pursuant to Section 13 and 15(d)

Summary of Property and Equipment (Detail)

v3.19.3.a.u2
Summary of Property and Equipment (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
$ / bbl
Dec. 31, 2018
USD ($)
$ / bbl
Dec. 31, 2017
USD ($)
$ / bbl
Dec. 31, 2016
USD ($)
Property, Plant and Equipment [Abstract]        
Proved Oil and Gas Property, Full Cost Method $ 1,409,219 $ 1,037,993    
Undeveloped Leasehold Costs Transferred 16,800 82,800    
Interest Costs Capitalized $ 4,100 $ 9,100 $ 2,700  
Amortization Expense Per Physical Unit of Production | $ / bbl 17.25 16.11 12.87  
Unproved Oil and Gas Property excluded $ 53,200 $ 63,500    
Capitalized Exploratory Well Costs   300    
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative 1,300 6,100 $ 43,100 $ 2,700
Capitalized Costs, Proved Properties 4,100 3,700 $ 2,400  
Oil and gas properties:        
Unproved Oil and Gas Property, Full Cost Method 53,200 63,484    
Oil and Gas Property, Full Cost Method, Gross 1,462,419 1,101,477    
Other property and equipment 25,915 20,383    
Total property and equipment 1,488,334 1,121,860    
Accumulated depreciation, depletion and amortization (367,909) (193,866)    
Property and equipment, net (successful efforts method) $ 1,120,425 $ 927,994