Contingencies and Commitments (Details) (USD $)			9 Months Ended						1 Months Ended					9 Months Ended				1 Months Ended			9 Months Ended	1 Months Ended		9 Months Ended	1 Months Ended	9 Months Ended	12 Months Ended	1 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Tutor-Saliba-Perini Joint Venture vs. Los Angeles MTA Matter [Member]	Sep. 30, 2012 Tutor Saliba Perini Joint Venture vs Los Angeles MTA Matter - Tunnel Handrail Verdict [Member]	Sep. 30, 2012 Perini/Kiewit/Cashman Joint Venture-Central Artery/Tunnel Project Matter [Member]	Feb. 29, 2012 Perini/Kiewit/Cashman Joint Venture-Central Artery/Tunnel Project Matter [Member]	Oct. 31, 2011 Perini/Kiewit/Cashman Joint Venture-Central Artery/Tunnel Project Matter [Member]	Dec. 31, 2010 Perini/Kiewit/Cashman Joint Venture-Central Artery/Tunnel Project Matter [Member]	Feb. 29, 2012 Long Island Expressway/Cross Island Parkway Matter [Member]	Mar. 31, 2011 Long Island Expressway/Cross Island Parkway Matter [Member]	May 31, 2012 Long Island Expressway/Cross Island Parkway Matter [Member]	Sep. 30, 2011 Long Island Expressway/Cross Island Parkway Matter [Member]	Feb. 28, 2006 Long Island Expressway/Cross Island Parkway Matter [Member]	Sep. 30, 2012 Gaylord Hotel and Convention Center Matter [Member]	Sep. 30, 2012 Fontainebleau Matter [Member]	May 31, 2010 Fontainebleau Matter [Member]	Jun. 30, 2009 Fontainebleau Matter [Member]	Oct. 31, 2012 MGM CityCenter Matter [Member]	Dec. 31, 2011 MGM CityCenter Matter [Member]	May 31, 2010 MGM CityCenter Matter [Member]	Sep. 30, 2012 MGM CityCenter Matter [Member] acre	Jun. 30, 2003 Honeywell Street/Queens Boulevard Bridges Matter [Member]	Mar. 31, 2010 Honeywell Street/Queens Boulevard Bridges Matter [Member]	Sep. 30, 2012 Westgate Planet Hollywood Matter [Member]	Apr. 30, 2010 Brightwater Matter [Member]	Sep. 30, 2012 Brightwater Matter [Member]	Dec. 31, 2006 Brightwater Matter [Member]	Jun. 30, 2012 156 Stations Matter [Member]	Dec. 31, 2003 156 Stations Matter [Member]
Loss Contingencies [Line Items]
Settlement on judgment			$ 3,000,000	$ 500,000																								$ 11,900,000
Ownership percentage in joint venture (in hundredths)					56.00%																						20.00%
Period over which series of claims instituted					10 years
Estimated 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
Total value of DRB awards issued in PKC's favor					128,000,000
Total value of binding DRB awards issued in PKC's favor					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
Estimated value of project completed in Feb. 2006													130,000,000
Value of claim filed									53,800,000	53,800,000				40,000,000								8,750,000			(74,000,000)	(132,000,000)
Amount receivable as per final agreement												500,000
Value of counterclaim filed											151,000,000												74,600,000	45,000,000	75,000,000
Business interruption costs assigned to PTJV														11,000,000
Number of rooms in hotel/casino complex															3,800
Total outstanding liens on property, including subcontractors' liens																	44,000,000				191,300,000			23,200,000
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
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
Number of cases in legal matter																		2
Number of separate juries in legal matter																		2
Amount settled at discount with MGM																					301,000,000
Contracts receivable recorded by entity	1,249,787,000	1,275,031,000																			192,000,000
Number of Company's subsidiaries paid partial amounts due for contract receivables																			1
Partial collection of amounts owed																			15,000,000
Pass-through subcontractor billings																					48,000,000			12,000,000
Value of mechanic's lien release bond																								22,300,000
Value of cross complaint filed																								$ 51,000,000
Number of subcontractor claims settled before trial																								2
Number of stations for the New York City Transit Authority																													156
Maximum number of days awarded claim must be paid (in days)																												45 days