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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties $ 4,717,065 [1] $ 3,713,525 [1]
Less: Accumulated depreciation, depletion, amortization and impairment (890,785) (612,380)
Proved oil and gas properties, net 3,826,280 3,101,145
Unproved oil and gas properties 829,359 815,433
Total oil and gas properties, net 4,655,639 3,916,578
Other property and equipment 261,665 188,468
Less: Accumulated depreciation (42,452) (25,296)
Other property and equipment, net 219,213 163,172
Total property, plant and equipment, net $ 4,874,852 $ 4,079,750
[1] Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $36.4 million and $32.6 million at September 30, 2014 and December 31, 2013, respectively.