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
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Common Share (EPS) [Abstract]
Net income (loss) attributable to Tutor Perini Corporation	$ 17,371	$ (356)
Weighted-average common shares outstanding, basic	50,338	50,098
Effect of dilutive restricted stock units and stock options	498
Weighted-average common shares outstanding, diluted	50,836	50,098
Net income (loss) attributable to Tutor Perini Corporation per common share: Basic	$ 0.35	$ (0.01)
Net income (loss) attributable to Tutor Perini Corporation per common share: Diluted	$ 0.34	$ (0.01)
Anti-dilutive securities not included above	2,209	4,518