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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Common Share (EPS) [Abstract]
Net income (loss) attributable to Tutor Perini Corporation	$ (320,530)	$ 24,883	$ (320,886)	$ 12,759
Weighted-average common shares outstanding, basic	50,224	49,946	50,161	49,880
Effect of dilutive restricted stock units and stock options	0	494		247
Weighted-average common shares outstanding, diluted	50,224	50,440	50,161	50,127
Net income (loss) attributable to Tutor Perini Corporation per common share: Basic	$ (6.38)	$ 0.50	$ (6.40)	$ 0.26
Net income (loss) attributable to Tutor Perini Corporation per common share: Diluted	$ (6.38)	$ 0.49	$ (6.40)	$ 0.25
Anti-dilutive securities not included above	4,191	1,682	4,354	3,095