Earnings Per Common Share (EPS) (Calculations of the Basic and Diluted EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Common Share (EPS) [Abstract]
Net income attributable to Tutor Perini Corporation	$ 24,883	$ 30,096	$ 12,759	$ 43,860
Weighted-average common shares outstanding, basic	49,946	49,735	49,880	49,510
Effect of dilutive restricted stock units and stock options	494	1,020	247	1,343
Weighted-average common shares outstanding, diluted	50,440	50,755	50,127	50,853
Net income attributable to Tutor Perini Corporation per common share: Basic	$ 0.50	$ 0.61	$ 0.26	$ 0.89
Net income attributable to Tutor Perini Corporation per common share: Diluted	$ 0.49	$ 0.59	$ 0.25	$ 0.86
Anti-dilutive securities not included above	1,682	353	3,095	672