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Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Equipment	$ 5,387,490	$ 4,730,925
Oil and natural gas properties	156,834	131,812
Buildings	66,490	64,090
Land	10,413	11,467
Property, Plant and Equipment, Gross, Total	5,621,227	4,938,294
Less accumulated depreciation and depletion	(2,005,844)	(1,771,028)
Property and equipment, net	$ 3,615,383	$ 3,167,266

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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Gross amount, as of the balance sheet date, of long-lived, depreciable assets used in the production process to produce goods and services.

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

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