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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties $ 3,713,525 $ 2,271,711
Less: Accumulated depreciation, depletion, amortization and impairment (612,380) (383,564)
Proved oil and gas properties, net 3,101,145 1,888,147
Unproved oil and gas properties 815,433 76,417
Other property and equipment 188,468 49,732
Less: Accumulated depreciation (25,296) (7,696)
Other property and equipment, net 163,172 42,036
Total property, plant and equipment, net $ 4,079,750 $ 2,006,600