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Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Equipment | $ 5,029,295 | $ 4,730,925
Oil and natural gas properties | 145,303 | 131,812
Buildings | 62,418 | 64,090
Land | 10,411 | 11,467
Property, Plant and Equipment, Gross, Total | 5,247,427 | 4,938,294
Less accumulated depreciation and depletion | (1,845,014) | (1,771,028)
Property and equipment, net | $ 3,402,413 | $ 3,167,266

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