Contingencies and Commitments (Details) $ in Thousands					1 Months Ended			12 Months Ended
	Oct. 01, 2014 USD ($)	Mar. 20, 2014 USD ($)	Oct. 30, 2013 USD ($)	Aug. 20, 2013 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2011 USD ($)	Jun. 30, 2003 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2009 USD ($) room	Sep. 30, 2016 USD ($) ft² claim	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								$ 1,473,615		$ 1,718,685
Tutor Perini Corporation [Member]
Loss Contingencies [Line Items]
Contract receivables								358,437		$ 407,677
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]
Pre-tax charge								$ 23,900
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