Quarterly report pursuant to Section 13 or 15(d)

Summary of Property and Equipment (Detail)

v3.21.1
Summary of Property and Equipment (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
$ / bbl
Mar. 31, 2020
USD ($)
$ / bbl
Dec. 31, 2020
USD ($)
Property, Plant and Equipment [Abstract]      
Proved Oil and Gas Property, Full Cost Method $ 1,626,435   $ 1,545,910
Unproved Oil and Gas Property, Full Cost Method 63,489   49,935
Oil and Gas Property, Full Cost Method, Gross 1,689,924   1,595,845
Total properties and equipment 1,717,720   1,623,591
Other property and equipment 27,796   27,746
Accumulated depreciation, depletion and amortization (925,643)   (900,042)
Property and equipment, net (successful efforts method) 792,077   723,549
Unproved Oil and Gas Property excluded 63,500   49,900
Capitalized Costs of Unproved Properties Excluded from Amortization, Period Cost   $ 500 $ 1,200
Undeveloped Leasehold Costs Transferred 7,600 1,400  
Capitalized Costs, Proved Properties 700 800  
Interest Costs Capitalized $ 800 $ 700  
Amortization Expense Per Physical Unit of Production | $ / bbl 12.92 16.73  
Impairments of oil and gas properties $ 1,811 $ 0