Annual report pursuant to Section 13 and 15(d)

Supplemental Information on Oil and Gas Producing Activities (Unaudited) (Detail)

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Supplemental Information on Oil and Gas Producing Activities (Unaudited) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Capitalized Costs Relating to Oil and Gas Producing Activities      
Proved properties $ 11,859,817 $ 12,705,672  
Unproved properties 1,368,854 1,767,600  
Total 13,228,671 14,473,272  
Accumulated depletion and depreciation (3,284,330) (3,615,680)  
Net capitalized costs 9,944,341 10,857,592  
Costs Incurred in Certain Oil and Gas Activities      
Proved property     $ 175,650
Unproved property 88,682 172,387 204,272
Development costs 1,104,336 1,164,800 897,287
Exploration costs 149,782 323,773 384,698
Total costs incurred 1,342,800 1,660,960 1,661,907
Results of Operations for Oil and Gas Producing Activities      
Revenues 3,643,873 3,652,894 2,747,920
Operating expenses:      
Production expenses 2,417,509 1,601,985 1,279,217
Exploration expenses 884 4,958 8,538
Depletion and depreciation 884,350 832,326 694,332
Impairment of unproved properties 1,300,444 549,437 159,598
Results of operations before income tax expense (benefit) (959,314) 664,188 606,235
Income tax expense 224,511 (156,350) (228,096)
Results of operations $ (734,803) $ 507,838 $ 378,139