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Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Equipment	$ 5,545,029	$ 5,387,490
Oil and natural gas properties	164,824	156,834
Buildings	67,585	66,490
Land	11,899	10,413
Property, Plant and Equipment, Gross, Total	5,789,337	5,621,227
Less accumulated depreciation and depletion	(2,106,587)	(2,005,844)
Property and equipment, net	$ 3,682,750	$ 3,615,383

X

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Oil and Gas properties, gross, carried under the successful effort method.

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