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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.

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