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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties $ 4,305,827 [1] $ 3,713,525 [1]
Less: Accumulated depreciation, depletion, amortization and impairment (787,418) (612,380)
Proved oil and gas properties, net 3,518,409 3,101,145
Unproved oil and gas properties 835,755 815,433
Total oil and gas properties, net 4,354,164 3,916,578
Other property and equipment 231,129 188,468
Less: Accumulated depreciation (36,082) (25,296)
Other property and equipment, net 195,047 163,172
Total property, plant and equipment, net $ 4,549,211 $ 4,079,750
[1] Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $33.4 million and $32.6 million at June 30, 2014 and December 31, 2013, respectively.