Contingencies and Commitments (Details) (USD $)			12 Months Ended							1 Months Ended					12 Months Ended				1 Months Ended		12 Months Ended			1 Months Ended		12 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended		1 Months Ended				6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Tutor-Saliba-Perini Joint Venture vs. Los Angeles MTA Matter [Member]	Dec. 31, 2012 Tutor Saliba Perini Joint Venture vs Los Angeles MTA Matter - Tunnel Handrail Verdict [Member]	Dec. 31, 2012 Perini/Kiewit/Cashman Joint Venture-Central Artery/Tunnel Project Matter [Member] Person Panel	Jan. 31, 2013 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]	Dec. 31, 2012 Gaylord Hotel and Convention Center Matter [Member]	Dec. 31, 2012 Fontainebleau Matter [Member] Room	May 31, 2010 Fontainebleau Matter [Member]	Jun. 30, 2009 Fontainebleau Matter [Member]	Oct. 31, 2012 MGM CityCenter Matter [Member] Jury Case	May 31, 2010 MGM CityCenter Matter [Member] Building	Dec. 31, 2012 MGM CityCenter Matter [Member] acre Contract	Dec. 31, 2011 MGM CityCenter Matter [Member] Counterparty	Sep. 30, 2012 MGM CityCenter Matter [Member]	Jun. 30, 2003 Honeywell Street/Queens Boulevard Bridges Matter [Member]	Mar. 31, 2010 Honeywell Street/Queens Boulevard Bridges Matter [Member]	Dec. 31, 2012 Westgate Planet Hollywood Matter [Member] Claim	Apr. 30, 2010 Brightwater Matter [Member]	Dec. 31, 2012 Brightwater Matter [Member]	Dec. 31, 2012 Brightwater Matter [Member]	Dec. 31, 2006 Brightwater Matter [Member]	Dec. 31, 2012 Natural Resources and Parks Wastewater Treatment Division of King County [Member]	Dec. 31, 2012 Vinci Construction Grands Projects/Parsons RCI/Frontier Kemper, Joint Venture [Member]	Jun. 30, 2012 156 Stations Matter [Member]	Dec. 31, 2003 156 Stations Matter [Member] Station	Jun. 30, 2012 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
Payment for backcharges and interest						14,800,000
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	1,224,613,000	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
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
Verdict awarded by jury																															155,800,000	26,300,000
Provision for contingency accrual																												$ 5,000,000
Number of stations for the New York City Transit Authority																																		156
Maximum number of days awarded claim must be paid (in days)																																			45 days