Contingencies and Commitments (Details) $ in Thousands	1 Months Ended							12 Months Ended
	Jan. 31, 2017 USD ($)	Mar. 31, 2015 USD ($)	Oct. 31, 2014 USD ($)	Oct. 31, 2013 USD ($)	Aug. 31, 2013 USD ($)	Mar. 31, 2011 USD ($)	Jun. 30, 2003 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 claim	Dec. 31, 2009 property	Dec. 31, 2016 USD ($) ft²	May 31, 2012 USD ($)	Sep. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)	Jul. 31, 2010 USD ($)	May 31, 2010 USD ($)	Mar. 31, 2010 USD ($)	Jun. 30, 2009 USD ($)	Feb. 28, 2006 USD ($)
Contingencies and Commitments
Contract receivables								$ 1,473,615			$ 1,743,300
Subsequent Event [Member]
Contingencies and Commitments
Release of retention plus interest from 2010	$ 1,100
Long Island Expressway/Cross Island Parkway Matter [Member]
Contingencies and Commitments
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]
Contingencies and Commitments
Number of rooms in hotel/casino complex | property										3,800
Total outstanding liens on property, including subcontractors' liens																		$ 44,000
Amount of court order in favor of plaintiff																$ 45,000
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]
Contingencies and Commitments
Value of claim filed							$ 8,800
Value of counterclaim filed																	$ 74,600
Westgate Planet Hollywood Matter [Member]
Contingencies and Commitments
Settlement on judgment								19,700
Value of counterclaim filed														$ 45,000
Total outstanding liens on property, including subcontractors' liens														23,200
Settlement receipt								600
Value of mechanic's lien release bond								22,300						22,300
Value of cross complaint filed														$ 51,000
Damages awarded to WPH which are anticipated to be paid by the OCIP carrier								3,100
Additional supersedeas bond								1,700
Total value of security								24,000
Brightwater Matter [Member]
Contingencies and Commitments
Pre-tax charge								$ 23,900
U.S. Department of Commerce, National Oceanic and Atmospheric Administration Matter [Member]
Contingencies and Commitments
Settlement on judgment		$ 1,000
Value of claim filed			$ 700	$ 2,600	$ 26,800
Square footage of facility | ft²											287,000
Certified claims filed | claim									3
Total awards denied		$ 29,500