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Major Accounting Policies - Tax Effects of Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other comprehensive income (loss), Before-Tax Amount:      
Total other comprehensive income (loss), Before-Tax $ 138,062 $ (100,223) $ 78,062
Less: Other comprehensive loss attributable to noncontrolling interests, Before-Tax (796) (42) (1,267)
Other comprehensive income (loss) attributable to Fluor Corporation, Before-Tax 138,858 (100,181) 79,329
Other comprehensive income (loss), Tax (Expense) Benefit:      
Total other comprehensive income (loss), Tax Benefit (Expense) (44,431) 36,287 (27,892)
Other comprehensive income (loss) attributable to Fluor Corporation, Tax Benefit (Expense) (44,431) 36,287 (27,892)
Other comprehensive income (loss), Net-of-Tax Amount:      
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX 93,631 (63,936) 50,170
Less: Other comprehensive loss attributable to noncontrolling interests, Net-of-Tax (796) (42) (1,267)
Other comprehensive income (loss) attributable to Fluor Corporation, Net-of-Tax 94,427 (63,894) 51,437
Foreign currency translation adjustment, including noncontrolling interests      
Other comprehensive income (loss), Before-Tax Amount:      
Total other comprehensive income (loss), Before-Tax 110,291 (102,707) (166,487)
Other comprehensive income (loss), Tax (Expense) Benefit:      
Total other comprehensive income (loss), Tax Benefit (Expense) (35,867) 38,327 61,892
Other comprehensive income (loss), Net-of-Tax Amount:      
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX 74,424 (64,380) (104,595)
Ownership share of equity method investees' other comprehensive income (loss), including noncontrolling interests      
Other comprehensive income (loss), Before-Tax Amount:      
Total other comprehensive income (loss), Before-Tax (1,163) 8,734 (12,226)
Other comprehensive income (loss), Tax (Expense) Benefit:      
Total other comprehensive income (loss), Tax Benefit (Expense) 462 (2,698) 4,713
Other comprehensive income (loss), Net-of-Tax Amount:      
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX (701) 6,036 (7,513)
Defined benefit pension and postretirement plan adjustments, including noncontrolling interests      
Other comprehensive income (loss), Before-Tax Amount:      
Total other comprehensive income (loss), Before-Tax 22,052 (5,518) 257,414
Other comprehensive income (loss), Tax (Expense) Benefit:      
Total other comprehensive income (loss), Tax Benefit (Expense) (6,443) 381 (94,799)
Other comprehensive income (loss), Net-of-Tax Amount:      
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX 15,609 (5,137) 162,615
Unrealized gain (loss) on derivative contracts, including noncontrolling interests      
Other comprehensive income (loss), Before-Tax Amount:      
Total other comprehensive income (loss), Before-Tax 7,593 (1,064) (302)
Other comprehensive income (loss), Tax (Expense) Benefit:      
Total other comprehensive income (loss), Tax Benefit (Expense) (2,850) 402 176
Other comprehensive income (loss), Net-of-Tax Amount:      
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX 4,743 (662) (126)
Unrealized gain (loss) on available-for-sale securities, including noncontrolling interests      
Other comprehensive income (loss), Before-Tax Amount:      
Total other comprehensive income (loss), Before-Tax (711) 332 (337)
Other comprehensive income (loss), Tax (Expense) Benefit:      
Total other comprehensive income (loss), Tax Benefit (Expense) 267 (125) 126
Other comprehensive income (loss), Net-of-Tax Amount:      
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX $ (444) $ 207 $ (211)