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Acquisitions and Divestitures - Divestiture of Subsidiary (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Dec. 31, 2015
Sale of ownership interest      
Cash purchase price     $ 45,566
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% 50.00%  
Cash purchase price $ 46,000    
Pre-tax non-operating gain on the partial sale of subsidiary $ 68,000 $ 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