Contingencies and Commitments (Details) $ in Thousands					1 Months Ended			3 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 ($)	Mar. 31, 2017 USD ($) ft² claim	Mar. 31, 2016 USD ($)	Dec. 31, 2009 USD ($) room	Dec. 31, 2016 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								$ 1,749,602			$ 1,743,300
Income from construction operations								37,017	$ 40,122
Tutor Perini Corporation [Member]
Loss Contingencies [Line Items]
Contract receivables								435,844			$ 426,176
Income from construction operations								185	$ 778
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
Release of retention plus interest								$ 1,100
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
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