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Partial Sale of a Subsidiary (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2015
Sale of ownership interest
Pre-tax non-operating gain on the partial sale of subsidiary			$ 68,162
Fluor S.A.
Sale of ownership interest
Ownership interest sold (as a percent)	50.00%
Cash purchase price	$ 46,000
Pre-tax non-operating gain on the partial sale of subsidiary		$ 68,000
Retained noncontrolling interest (as a percent)	50.00%
Fair value, measurements, nonrecurring | Level 3 | Retained noncontrolling interest | Fluor S.A.
Sale of ownership interest
Estimated fair value	$ 44,000	$ 44,000

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Percentage of subsidiary's or equity investee's stock owned by parent company sold in stock transaction.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Amount of gain (loss) on sale or disposal of equity in securities of subsidiaries or equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(g))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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