Comprehensive Income (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Changes in AOCI balances by component (after-tax) attributable to Fluor Corporation
Accumulated Other Comprehensive Income (Loss), Net, balance at the beginning of the period	$ (265,321)		$ (257,850)
Other comprehensive income (loss) before reclassifications	(39,829)		(49,366)
Amounts reclassified from AOCI	2,477		4,543
Other comprehensive income (loss) attributable to Fluor Corporation, Net-of-Tax Amount	(37,352)	(26,771)	(44,823)	8,917
Accumulated Other Comprehensive Income (Loss), Net, balance at the end of the period	(302,673)		(302,673)
Changes in AOCI balances by component (after-tax) attributable to Noncontrolling Interest
Noncontrolling interest AOCI , balance at the beginning of the period			85,799
Net other comprehensive income (loss)	560	(291)	53	(337)
Noncontrolling interest AOCI, balance at the end of the period	140,182		140,182
Foreign Currency Translation
Changes in AOCI balances by component (after-tax) attributable to Fluor Corporation
Accumulated Other Comprehensive Income (Loss), Net, balance at the beginning of the period	30,961		45,899
Other comprehensive income (loss) before reclassifications	(41,863)		(56,801)
Other comprehensive income (loss) attributable to Fluor Corporation, Net-of-Tax Amount	(41,863)		(56,801)
Accumulated Other Comprehensive Income (Loss), Net, balance at the end of the period	(10,902)		(10,902)
Changes in AOCI balances by component (after-tax) attributable to Noncontrolling Interest
Noncontrolling interest AOCI , balance at the beginning of the period	8,217		8,723
Other comprehensive income (loss) before reclassifications	560		54
Net other comprehensive income (loss)	560		54
Noncontrolling interest AOCI, balance at the end of the period	8,777		8,777
Ownership Share of Equity Method Investees' Other Comprehensive Income (Loss)
Changes in AOCI balances by component (after-tax) attributable to Fluor Corporation
Accumulated Other Comprehensive Income (Loss), Net, balance at the beginning of the period	(42,805)		(43,019)
Other comprehensive income (loss) before reclassifications	5,877		6,091
Other comprehensive income (loss) attributable to Fluor Corporation, Net-of-Tax Amount	5,877		6,091
Accumulated Other Comprehensive Income (Loss), Net, balance at the end of the period	(36,928)		(36,928)
Defined Benefit Pension and Postretirement Plans
Changes in AOCI balances by component (after-tax) attributable to Fluor Corporation
Accumulated Other Comprehensive Income (Loss), Net, balance at the beginning of the period	(245,483)		(252,724)
Other comprehensive income (loss) before reclassifications	(423)		4,796
Amounts reclassified from AOCI	2,007		4,029
Other comprehensive income (loss) attributable to Fluor Corporation, Net-of-Tax Amount	1,584		8,825
Accumulated Other Comprehensive Income (Loss), Net, balance at the end of the period	(243,899)		(243,899)
Unrealized Gain (Loss) on Derivative Contracts
Changes in AOCI balances by component (after-tax) attributable to Fluor Corporation
Accumulated Other Comprehensive Income (Loss), Net, balance at the beginning of the period	(8,807)		(8,960)
Other comprehensive income (loss) before reclassifications	(2,525)		(2,440)
Amounts reclassified from AOCI	531		599
Other comprehensive income (loss) attributable to Fluor Corporation, Net-of-Tax Amount	(1,994)		(1,841)
Accumulated Other Comprehensive Income (Loss), Net, balance at the end of the period	(10,801)		(10,801)
Changes in AOCI balances by component (after-tax) attributable to Noncontrolling Interest
Noncontrolling interest AOCI , balance at the beginning of the period			1
Amounts reclassified from AOCI			(1)
Net other comprehensive income (loss)			(1)
Unrealized Gain (Loss) on Available-for-Sale Securities
Changes in AOCI balances by component (after-tax) attributable to Fluor Corporation
Accumulated Other Comprehensive Income (Loss), Net, balance at the beginning of the period	813		954
Other comprehensive income (loss) before reclassifications	(895)		(1,012)
Amounts reclassified from AOCI	(61)		(85)
Other comprehensive income (loss) attributable to Fluor Corporation, Net-of-Tax Amount	(956)		(1,097)
Accumulated Other Comprehensive Income (Loss), Net, balance at the end of the period	(143)		(143)
Accumulated Other Comprehensive Income (Loss), Net
Changes in AOCI balances by component (after-tax) attributable to Noncontrolling Interest
Noncontrolling interest AOCI , balance at the beginning of the period	8,217		8,724
Other comprehensive income (loss) before reclassifications	560		54
Amounts reclassified from AOCI			(1)
Net other comprehensive income (loss)	560		53
Noncontrolling interest AOCI, balance at the end of the period	$ 8,777		$ 8,777