Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share
Net earnings (loss) attributable to Fluor Corporation	$ (58,426)	$ (17,590)
Basic EPS attributable to Fluor Corporation:
Weighted average common shares outstanding (in shares)	139,776,000	140,099,000
Basic earnings (loss) per share (in dollars per share)	$ (0.42)	$ (0.13)
Diluted EPS attributable to Fluor Corporation:
Weighted average common shares outstanding (in shares)	139,776,000	140,099,000
Diluted effect:
Employee stock options, restricted stock units and shares and Value Driver Incentive units (in shares)	0	0
Weighted average diluted shares outstanding (in shares)	139,776,000	140,099,000
Diluted earnings (loss) per share (in dollars per share)	$ (0.42)	$ (0.13)
Anti-dilutive securities not included above (in shares)	4,776,000	4,159,000
Employee stock options, restricted stock units and shares, and Value Driver Incentive units
Diluted effect:
Anti-dilutive securities not included above (in shares)	740,000	1,143,000