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Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Total property and equipment	$ 8,797,884	$ 8,490,038
Less accumulated depreciation, depletion and impairment	(4,716,984)	(4,235,308)
Property and equipment, net	4,080,900	4,254,730
Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	8,366,513	8,066,404
Oil and natural gas properties
Property Plant And Equipment [Line Items]
Total property and equipment	218,511	211,566
Buildings
Property Plant And Equipment [Line Items]
Total property and equipment	186,716	185,475
Land
Property Plant And Equipment [Line Items]
Total property and equipment	$ 26,144	$ 26,593

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, 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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