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Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Equipment	$ 5,915,271	$ 5,749,975
Oil and natural gas properties	192,299	183,571
Buildings	80,646	80,050
Land	12,048	12,054
Property, Plant and Equipment, Gross, Total	6,200,264	6,025,650
Less accumulated depreciation and depletion	(2,483,692)	(2,390,109)
Property and equipment, net	$ 3,716,572	$ 3,635,541

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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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