CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net earnings (loss) from Cont Ops	$ 43,222	$ 25,711	$ 638	$ 47,949
Net earnings (loss) from Disc Ops	(5,872)	(2,071)	(139,110)	(299,021)
Net earnings (loss)	37,350	23,640	(138,472)	(251,072)
OCI, net of tax:
Foreign currency translation adjustment	(18,712)	4,201	(17,292)	(75,828)
Ownership share of equity method investees’ OCI	(2,973)	(34)	(5,112)	(18,860)
DB plan adjustments	1,163	1,070	4,005	3,071
Unrealized gain (loss) on hedges	(2,279)	9,588	(4,755)	5,883
Total OCI, net of tax	(22,801)	14,825	(23,154)	(85,734)
Comprehensive income (loss)	14,549	38,465	(161,626)	(336,806)
Less: Comprehensive income (loss) attributable to NCI	(764)	3,804	24,288	18,245
Comprehensive income (loss) attributable to Fluor	$ 15,313	$ 34,661	$ (185,914)	$ (355,051)