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Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Equipment	$ 5,749,975	$ 5,387,490
Oil and natural gas properties	183,571	156,834
Buildings	80,050	66,490
Land	12,054	10,413
Property, Plant and Equipment, Gross, Total	6,025,650	5,621,227
Less accumulated depreciation and depletion	(2,390,109)	(2,005,844)
Property and equipment, net	$ 3,635,541	$ 3,615,383

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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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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