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Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Detail) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Proved oil and gas properties $ 2,004,433,000 [1] $ 1,152,532,000 [1]
Less: Accumulated depreciation, depletion, amortization and impairment (314,787,000) (174,948,000)
Proved oil and gas properties, net 1,689,646,000 977,584,000
Unproved oil and gas properties 74,583,000 82,825,000
Oil and gas properties, net 1,764,229,000 1,060,409,000
Other property and equipment 45,261,000 20,859,000
Less: Accumulated depreciation (5,691,000) (1,313,000)
Other property and equipment, net 39,570,000 19,546,000
Total property, plant and equipment, net 1,803,799,000 1,079,955,000
Asset retirement costs 18,500,000 11,400,000
Capitalized interest $ 5,600,000 $ 3,100,000
[1] Included in the Company's proved oil and gas properties are estimates of future asset retirement costs of $18.5 million and $11.4 million at September 30, 2012 and December 31, 2011, respectively. In addition, the Company's proved oil and gas properties include cumulative capitalized interest of $5.6 million and $3.1 million at September 30, 2012 and December 31, 2011, respectively.