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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties $ 5,655,759 $ 5,156,875
Less: Accumulated depreciation, depletion, amortization and impairment (1,428,427) (1,043,121)
Proved oil and gas properties, net 4,227,332 4,113,754
Unproved oil and gas properties 628,642 809,265
Other property and equipment 443,265 313,439
Less: Accumulated depreciation (80,997) (49,672)
Other property and equipment, net 362,268 263,767
Total property, plant and equipment, net $ 5,218,242 $ 5,186,786