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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Common Share (EPS) [Abstract]
Net income (loss) attributable to Tutor Perini Corporation	$ 18,709	$ (320,530)	$ 36,080	$ (320,886)
Weighted-average common shares outstanding, basic	50,667	50,224	50,502	50,161
Effect of dilutive restricted stock units and stock options	268		383
Weighted-average common shares outstanding, diluted	50,935	50,224	50,885	50,161
Net income (loss) attributable to Tutor Perini Corporation per common share: Basic	$ 0.37	$ (6.38)	$ 0.71	$ (6.40)
Net income (loss) attributable to Tutor Perini Corporation per common share: Diluted	$ 0.37	$ (6.38)	$ 0.71	$ (6.40)
Anti-dilutive securities not included above	2,209	4,191	2,209	4,354