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Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Oil and natural gas properties    
Proved $ 9,975,304 [1] $ 12,262,921 [1]
Unproved 548,923 865,863
Total oil and natural gas properties 10,524,227 13,128,784
Less accumulated depreciation, depletion and impairment (5,384,132) (5,231,182)
Net oil and natural gas properties capitalized costs 5,140,095 7,897,602
Land 17,929 17,927
Non-oil and natural gas equipment 657,115 [2] 643,370 [2]
Buildings and structures 214,884 205,349
Total 889,928 866,646
Less accumulated depreciation and amortization (294,417) (284,271)
Other property, plant and equipment, net 595,511 582,375
Total property, plant and equipment, net $ 5,735,606 $ 8,479,977
[1] Includes cumulative capitalized interest of $14.7 million and $11.7 million at March 31, 2013 and December 31, 2012, respectively.
[2] Includes cumulative capitalized interest of approximately $12.4 million and $11.4 million at March 31, 2013 and December 31, 2012, respectively.