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Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]    
Total property and equipment $ 8,299,215 $ 8,551,419
Less accumulated depreciation, depletion and impairment (5,406,043) (5,244,742)
Property and equipment, net 2,893,172 3,306,677
Equipment    
Property Plant And Equipment [Line Items]    
Total property and equipment 7,858,967 8,114,326
Oil and natural gas properties    
Property Plant And Equipment [Line Items]    
Total property and equipment 220,534 226,646
Buildings    
Property Plant And Equipment [Line Items]    
Total property and equipment 195,494 184,700
Land    
Property Plant And Equipment [Line Items]    
Total property and equipment $ 24,220 $ 25,747