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Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Abstract]
Equipment	$ 6,679,894us-gaap_MachineryAndEquipmentGross	$ 5,749,975us-gaap_MachineryAndEquipmentGross
Oil and natural gas properties	196,234us-gaap_OilAndGasPropertySuccessfulEffortMethodGross	183,571us-gaap_OilAndGasPropertySuccessfulEffortMethodGross
Buildings	83,465us-gaap_BuildingsAndImprovementsGross	80,050us-gaap_BuildingsAndImprovementsGross
Land	12,038us-gaap_Land	12,054us-gaap_Land
Property, Plant and Equipment, Gross, Total	6,971,631us-gaap_PropertyPlantAndEquipmentGross	6,025,650us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation, depletion and impairment	(2,840,560)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	(2,390,109)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net	$ 4,131,071us-gaap_PropertyPlantAndEquipmentNet	$ 3,635,541us-gaap_PropertyPlantAndEquipmentNet

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Topic 210

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-Section S99

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

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- Definition

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.

+ References

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- Definition

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

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- Definition

Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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

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-Topic 932

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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