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Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Proved oil and gas properties $ 1,691,964 [1] $ 1,152,532 [1]
Less: Accumulated depreciation, depletion, amortization and impairment (257,607) (174,948)
Proved oil and gas properties, net 1,434,357 977,584
Unproved oil and gas properties 77,606 82,825
Oil and gas properties, net 1,511,963 1,060,409
Other property and equipment 41,333 20,859
Less: Accumulated depreciation (3,922) (1,313)
Other property and equipment, net 37,411 19,546
Total property, plant and equipment, net 1,549,374 1,079,955
Asset retirement costs 15,200 11,400
Capitalized interest $ 4,700 $ 3,100
[1] Included in the Company's proved oil and gas properties are estimates of future asset retirement costs of $15.2 million and $11.4 million at June 30, 2012 and December 31, 2011, respectively. In addition, the Company's proved oil and gas properties include capitalized interest of $4.7 million and $3.1 million at June 30, 2012 and December 31, 2011, respectively.