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Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Total property and equipment	$ 8,490,038	$ 7,129,996
Less accumulated depreciation, depletion and impairment	(4,235,308)	(3,721,033)
Property and equipment, net	4,254,730	3,408,963
Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	8,066,404	6,809,129
Oil and natural gas properties
Property Plant And Equipment [Line Items]
Total property and equipment	211,566	201,568
Buildings
Property Plant And Equipment [Line Items]
Total property and equipment	185,475	97,029
Land
Property Plant And Equipment [Line Items]
Total property and equipment	$ 26,593	$ 22,270

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
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-SubTopic 10
-Section 50
-Paragraph 1
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-Section S99
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- Definition

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.

+ References

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+ References

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