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Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Equipment	$ 7,025,433	$ 6,679,894
Oil and natural gas properties	199,873	196,234
Buildings	90,029	83,465
Land	22,542	12,038
Property, Plant and Equipment, Gross, Total	7,337,877	6,971,631
Less accumulated depreciation, depletion and impairment	(3,091,730)	(2,840,560)
Property and equipment, net	$ 4,246,147	$ 4,131,071

X

- Definition

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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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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

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