Variable Interest Entities (Details) (USD $)	3 Months Ended		9 Months Ended									3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Partnership Majority	Sep. 30, 2013 Joint ventures Majority	Sep. 30, 2013 Unconsolidated variable interest entities	Dec. 31, 2012 Unconsolidated variable interest entities	Sep. 30, 2013 Unconsolidated variable interest entities Future funding commitment	Sep. 30, 2013 Consolidated variable interest entities	Dec. 31, 2012 Consolidated variable interest entities	Sep. 30, 2013 Primary beneficiary Fluor SKM joint venture	Sep. 30, 2012 Primary beneficiary Fluor SKM joint venture	Sep. 30, 2013 Primary beneficiary Fluor SKM joint venture	Sep. 30, 2012 Primary beneficiary Fluor SKM joint venture
Variable interest entity information
Entity's interest in joint venture (as a percent)					50.00%	50.00%
Carrying value of the unconsolidated VIEs							$ 150,000,000	$ 22,000,000
Future funding amount									38,000,000
Carrying value of assets										1,300,000,000	1,000,000,000
Carrying value of liabilities										765,000,000	664,000,000
Revenue	$ 6,684,216,000	$ 7,136,056,000	$ 21,060,168,000	$ 20,554,413,000								$ 322,000,000	$ 1,000,000,000	$ 1,600,000,000	$ 2,500,000,000