Contingencies and Commitments (Details) $ in Thousands						1 Months Ended										3 Months Ended	6 Months Ended	12 Months Ended
	May. 05, 2015 USD ($)	Oct. 01, 2014 USD ($)	Mar. 20, 2014 USD ($)	Oct. 30, 2013 USD ($)	Aug. 20, 2013 USD ($)	Mar. 31, 2015 USD ($)	Jan. 31, 2015 USD ($)	Apr. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jun. 30, 2012 USD ($)	Mar. 31, 2011 USD ($)	Sep. 30, 2010 USD ($)	Apr. 30, 2010 USD ($)	Dec. 31, 2003 item	Jun. 30, 2003 USD ($)	Dec. 31, 2012 USD ($)	Jun. 30, 2015 USD ($) ft² claim	Dec. 31, 2009 USD ($) room	Mar. 09, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jul. 31, 2014 USD ($)	May. 31, 2012 USD ($)	Sep. 30, 2011 USD ($)	Jul. 31, 2010 USD ($)	May. 31, 2010 USD ($)	Mar. 31, 2010 USD ($)	Jun. 30, 2009 USD ($)	Feb. 28, 2006 USD ($)
Loss Contingencies [Line Items]
Contract receivables																	$ 1,553,514			$ 1,479,504
Tutor Perini Corporation [Member]
Loss Contingencies [Line Items]
Contract receivables																	$ 432,447			$ 299,427
Tutor-Saliba-Perini Joint Venture vs. Los Angeles MTA Matter [Member]
Loss Contingencies [Line Items]
Judgment in favor of TSP												$ 3,000
Tunnel handrail verdict against TSP												$ 500
Settlement receipt							$ 3,800
Total awards	$ 2,100
Long Island Expressway/Cross Island Parkway Matter [Member]
Loss Contingencies [Line Items]
Estimated value of project completed in Feb. 2006																												$ 130,000
Value of claim filed											$ 53,800
Amount receivable as per final agreement																							$ 500
Value of counterclaim filed																						$ 151,000
Fontainebleau Matter [Member]
Loss Contingencies [Line Items]
Number of rooms in hotel/casino complex | room																		3,800
Amount of court order in favor of plaintiff																									$ 45,000
Total outstanding liens on property, including subcontractors' liens																											$ 44,000
Amount set aside from approved sale for distribution to satisfy creditor claims																								$ 125,000
Estimated sustainable lien amount																								$ 350,000
Honeywell Street/Queens Boulevard Bridges Matter [Member]
Loss Contingencies [Line Items]
Value of claim filed															$ 8,800
Value of counterclaim filed																										$ 74,600
Westgate Planet Hollywood Matter [Member]
Loss Contingencies [Line Items]
Settlement receipt			$ 600
Total awards			19,700
Damages awarded which were anticipated to be paid including interest			$ 3,100
Value of cross complaint filed																		$ 51,000
Value of counterclaim filed																		45,000
Total outstanding liens on property, including subcontractors' liens																		23,200
Value of mechanic's lien release bond																		$ 22,300			$ 22,300
Value of supersedeas bond																					1,700
Total value of security																					$ 24,000
Brightwater Matter [Member]
Loss Contingencies [Line Items]
Ownership percentage in joint venture																	20.00%
Value of claim filed													$ 74,000
Value of counterclaim filed													$ 75,000
Appealed verdict award																			$ 17,000
Verdict awarded by jury									$ 155,800
Damages awarded									$ 26,300
Attorney's fees to be paid by VPFK								$ 14,700
Provision for contingency accrual																$ 5,000
156 Stations Matter [Member]
Loss Contingencies [Line Items]
Settlement receipt										$ 8,500
Total awards										$ 11,900
Number of stations for the New York City Transit Authority | item														156
U.S. Department of Commerce, National Oceanic and Atmospheric Administration Matter [Member]
Loss Contingencies [Line Items]
Total awards						$ 1,000
Value of claim filed		$ 700		$ 2,600	$ 26,800
Number of claims | claim																	3
Square footage of facility | ft²																	287,000
Total awards denied						$ 29,500