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Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Oil and natural gas properties    
Proved(1) $ 10,663,810 [1] $ 12,262,921 [1]
Unproved 529,032 865,863
Total oil and natural gas properties 11,192,842 13,128,784
Less: accumulated depreciation, depletion and impairment (5,643,158) (5,231,182)
Net oil and natural gas properties capitalized costs 5,549,684 7,897,602
Land 18,423 17,927
Non-oil and natural gas equipment(2) 610,740 [2] 643,370 [2]
Buildings and structures(3) 230,508 [3] 205,349 [3]
Total 859,671 866,646
Less accumulated depreciation and amortization (283,281) (284,271)
Other property, plant and equipment, net 576,390 582,375
Total property, plant and equipment, net $ 6,126,074 $ 8,479,977
[1] Includes cumulative capitalized interest of approximately $20.7 million and $11.7 million at September 30, 2013 and December 31, 2012, respectively.
[2] Includes cumulative capitalized interest of approximately $4.3 million at both September 30, 2013 and December 31, 2012.
[3] Includes cumulative capitalized interest of approximately $10.7 million and $7.1 million at September 30, 2013 and December 31, 2012, respectively.