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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Common Share (EPS) [Abstract]
Net income (loss) attributable to Tutor Perini Corporation	$ 19,313	$ 21,272	$ (301,573)	$ 34,031
Weighted-average common shares outstanding, basic	50,279	50,018	50,201	49,927
Effect of dilutive restricted stock units and stock options	303	357		283
Weighted-average common shares outstanding, diluted	50,582	50,375	50,201	50,210
Net income (loss) attributable to Tutor Perini Corporation per common share: Basic	$ 0.38	$ 0.43	$ (6.01)	$ 0.68
Net income (loss) attributable to Tutor Perini Corporation per common share: Diluted	$ 0.38	$ 0.42	$ (6.01)	$ 0.68
Anti-dilutive securities not included above	1,665	2,107	3,458	2,765