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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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- Definition 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 + Details
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- Definition 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 + Details
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