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Property and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Total property and equipment $ 8,702,743 $ 8,490,038
Less accumulated depreciation, depletion and impairment (4,494,046) (4,235,308)
Property and equipment, net 4,208,697 4,254,730
Equipment    
Property Plant And Equipment [Line Items]    
Total property and equipment 8,275,471 8,066,404
Oil and natural gas properties    
Property Plant And Equipment [Line Items]    
Total property and equipment 215,846 211,566
Buildings    
Property Plant And Equipment [Line Items]    
Total property and equipment 185,282 185,475
Land    
Property Plant And Equipment [Line Items]    
Total property and equipment $ 26,144 $ 26,593