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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties $ 2,916,453 [1] $ 2,271,711 [1]
Less: Accumulated depreciation, depletion, amortization and impairment (568,567) (383,564)
Proved oil and gas properties, net 2,347,886 [2] 1,888,147 [2]
Unproved oil and gas properties 128,062 76,417
Total oil and gas properties, net 2,475,948 1,964,564
Other property and equipment 157,926 49,732
Less: Accumulated depreciation (20,606) (7,696)
Other property and equipment, net 137,320 [2] 42,036 [2]
Total property, plant and equipment, net $ 2,613,268 $ 2,006,600
[1] Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $24.0 million and $20.7 million at September 30, 2013 and December 31, 2012, respectively.
[2] The Company reclassed substantially all of its salt water disposal and other midstream assets from proved oil and gas properties to other property and equipment, effective January 1, 2013.