Contingencies and Commitments (Details) (USD $)	1 Months Ended	12 Months Ended	1 Months Ended			3 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended				12 Months Ended	1 Months Ended			3 Months Ended	1 Months Ended		3 Months Ended	1 Months Ended	12 Months Ended
	Jan. 31, 2015	Dec. 31, 2011	Dec. 31, 2014 item	Feb. 29, 2012	Oct. 31, 2011	Mar. 31, 2013	Dec. 31, 2014 item	Dec. 31, 2010	Dec. 31, 2000	Mar. 31, 2011	Dec. 31, 2009 property	Oct. 31, 2013	Jul. 30, 2013	Jul. 31, 2012 property	Mar. 31, 2005 acre contract	Dec. 31, 2012	Jun. 30, 2003	Apr. 30, 2013	Apr. 30, 2010	Dec. 31, 2012	May 31, 2014	Jun. 30, 2012	Dec. 31, 2003 item	Aug. 31, 2013	Dec. 31, 2013 claim	May 31, 2012	Sep. 30, 2011	Feb. 28, 2006	Jul. 31, 2010	May 31, 2010	Jun. 30, 2009	Mar. 31, 2010	Feb. 28, 2013
Contingencies and Commitments
Contract receivables			$ 1,479,504,000				$ 1,479,504,000																		1,291,246,000
Tutor-Saliba-Perini Joint Venture vs. Los Angeles MTA Matter
Contingencies and Commitments
Judgment in favor of TSP		3,000,000
Tunnel handrail verdict against TSP		500,000
Settlement receipt	3,800,000
Perini/Kiewit/Cashman Joint Venture-Central Artery/Tunnel Project Matter
Contingencies and Commitments
Ownership percentage in joint venture							56.00%
Estimated minimum costs of owner-directed changes to work									100,000,000
Number of construction experts in Disputes Review Board							3
Total number of Disputes Review Board panels			5				5
Total value of DRB awards issued in PKC's favor			128,000,000				128,000,000
Total value of binding DRB awards issued in PKC's favor			110,000,000				110,000,000
Amount of Third DRB awards previously awarded to PKC which have been vacated by Court								56,500,000
Amount of Fourth DRB awards that MHD moved to vacate								13,700,000
Amount of Fourth DRB awards previously awarded to PKC which have been vacated by Court					8,000,000
Interest award payment received by PKC from MHD				22,000,000
Payment for back charges and interest						14,800,000
Anticipated recovery							$88.7
Settlement receipt			88,700,000
Long Island Expressway/Cross Island Parkway Matter
Contingencies and Commitments
Estimated value of project completed in Feb. 2006																												130,000,000
Value of claim filed				53,800,000						53,800,000
Amount receivable as per final agreement																											500,000
Value of counterclaim filed																										151,000,000
Fontainebleau Matter
Contingencies and Commitments
Number of rooms in hotel/casino complex											3,800
Total outstanding liens on property, including subcontractors' liens																															44,000,000
Amount of court order in favor of plaintiff																														45,000,000
Amount set aside from approved sale for distribution to satisfy creditor claims																													125,000,000
Estimated sustainable lien amount																													350,000,000
MGM CityCenter Matter
Contingencies and Commitments
Number of contracts in project															19
Area allotted to the project (in acres)															66
Number of CityCenter buildings included in motion to be demolished														1
Estimated cost to repair facility																21,000,000
Estimated cost to repair facility due to design defects																15,000,000
Third party settlements attributable to alleged damages on the Harmon												33,000,000
Settlement on judgment													39,800,000
Amount settled with MGM			348,000,000				348,000,000
Contract receivables			145,300,000				145,300,000
Honeywell Street/Queens Boulevard Bridges Matter
Contingencies and Commitments
Value of claim filed																	8,800,000
Value of counterclaim filed																																74,600,000
Westgate Planet Hollywood Matter
Contingencies and Commitments
Value of counterclaim filed								45,000,000
Total outstanding liens on property, including subcontractors' liens								23,200,000
Settlement on judgment							19,700,000
Settlement receipt							600,000
Value of mechanic's lien release bond			24,000,000				24,000,000	22,300,000
Value of cross complaint filed								51,000,000
Damages awarded to WPH which are anticipated to be paid by the OCIP carrier							3,100,000
Additional supersedeas bond							1,700,000
Brightwater Matter
Contingencies and Commitments
Ownership percentage in joint venture							20.00%
Value of claim filed		132,000,000																	74,000,000
Value of counterclaim filed																			75,000,000
Verdict awarded by jury																155,800,000
Damages awarded																26,300,000
Attorney's fees to be paid by VPFK																		14,700,000
Provision for contingency accrual																				5,000,000
156 Stations Matter
Contingencies and Commitments
Amount of court order in favor of plaintiff																																	12,300,000
Settlement on judgment																					8,500,000	11,900,000
Number of stations for the New York City Transit Authority																							156
Maximum number of days awarded claim must be paid																						45 days
U.S. Department of Commerce, National Oceanic and Atmospheric Administration Matter [Member]
Contingencies and Commitments
Value of claim filed												$ 2,600,000												$ 26,800,000
Square footage of facility			287,000				287,000
Certified claims filed																									2