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Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Oil and natural gas properties    
Proved $ 10,355,137 [1] $ 12,262,921 [1]
Unproved 535,836 865,863
Total oil and natural gas properties 10,890,973 13,128,784
Less accumulated depreciation, depletion and impairment (5,515,168) (5,231,182)
Net oil and natural gas properties capitalized costs 5,375,805 7,897,602
Land 17,929 17,927
Non-oil and natural gas equipment 607,665 [2] 643,370 [2]
Buildings and structures 221,453 205,349
Total 847,047 866,646
Less accumulated depreciation and amortization (279,137) (284,271)
Other property, plant and equipment, net 567,910 582,375
Total property, plant and equipment, net $ 5,943,715 $ 8,479,977
[1] Includes cumulative capitalized interest of approximately $17.7 million and $11.7 million at June 30, 2013 and December 31, 2012, respectively.
[2] Includes cumulative capitalized interest of approximately $13.8 million and $11.4 million at June 30, 2013 and December 31, 2012, respectively.