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Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property Plant And Equipment [Line Items]    
Total property and equipment $ 7,129,996 $ 7,282,911
Less accumulated depreciation, depletion and impairment (3,721,033) (3,362,203)
Property and equipment, net 3,408,963 3,920,708
Equipment    
Property Plant And Equipment [Line Items]    
Total property and equipment 6,809,129 6,963,148
Oil and natural gas properties    
Property Plant And Equipment [Line Items]    
Total property and equipment 201,568 200,923
Buildings    
Property Plant And Equipment [Line Items]    
Total property and equipment 97,029 96,470
Land    
Property Plant And Equipment [Line Items]    
Total property and equipment $ 22,270 $ 22,370