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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties $ 3,985,490 [1] $ 3,713,525 [1]
Less: Accumulated depreciation, depletion, amortization and impairment (693,011) (612,380)
Proved oil and gas properties, net 3,292,479 [2] 3,101,145 [2]
Unproved oil and gas properties 835,412 815,433
Total oil and gas properties, net 4,127,891 3,916,578
Other property and equipment 200,158 188,468
Less: Accumulated depreciation (30,418) (25,296)
Other property and equipment, net 169,740 [2] 163,172 [2]
Total property, plant and equipment, net $ 4,297,631 $ 4,079,750
[1] Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $32.1 million and $32.6 million at March 31, 2014 and December 31, 2013, respectively.
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