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Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Total property and equipment $ 8,604,756 $ 8,803,668
Less accumulated depreciation, depletion and impairment (5,171,261) (4,801,119)
Property and equipment, net 3,433,495 4,002,549
Equipment    
Property Plant And Equipment [Line Items]    
Total property and equipment 8,165,044 8,370,933
Oil and natural gas properties    
Property Plant And Equipment [Line Items]    
Total property and equipment 223,526 219,855
Buildings    
Property Plant And Equipment [Line Items]    
Total property and equipment 189,568 186,736
Land    
Property Plant And Equipment [Line Items]    
Total property and equipment $ 26,618 $ 26,144