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, 2019	Mar. 31, 2018
Earnings Per Common Share (EPS) [Abstract]
Net income (loss) attributable to Tutor Perini Corporation	$ (356)	$ (12,124)
Weighted-average common shares outstanding, basic	50,098	49,814
Weighted-average common shares outstanding, diluted	50,098	49,814
Net income (loss) attributable to Tutor Perini Corporation per common share: Basic	$ (0.01)	$ (0.24)
Net income (loss) attributable to Tutor Perini Corporation per common share: Diluted	$ (0.01)	$ (0.24)
Anti-dilutive securities not included above	4,518	4,507