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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]      
Proved oil and gas properties $ 7,058,782 $ 6,476,833  
Less: Accumulated depreciation, depletion, amortization and impairment (2,395,153) (1,886,732)  
Proved oil and gas properties, net 4,663,629 4,590,101  
Unproved oil and gas properties 780,173 819,735  
Other property and equipment 868,746 618,790  
Less: Accumulated depreciation (139,062) (109,059)  
Other property and equipment, net 729,684 509,731  
Total property, plant and equipment, net $ 6,173,486 $ 5,919,567 $ 5,218,242