CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ (1,553,124)	$ 232,853	$ 226,764
OCI, net of tax:
Foreign currency translation adjustment	65,500	(100,561)	74,123
Ownership share of equity method investees' OCI	(11,784)	8,942	(701)
Defined benefit pension and postretirement plan adjustments	105,452	(52,591)	15,609
Unrealized gain (loss) on derivative contracts	3,140	274	4,743
Unrealized gain (loss) on available-for-sale securities	0	709	(444)
Total OCI, net of tax	162,308	(143,227)	93,330
Comprehensive income (loss)	(1,390,816)	89,626	320,094
Less: Comprehensive income (loss) attributable to NCI	(32,310)	57,145	72,297
Comprehensive income (loss) attributable to Fluor Corporation	$ (1,358,506)	$ 32,481	$ 247,797