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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, 2018	Mar. 31, 2017
Earnings Per Common Share (EPS) [Abstract]
Net income (loss) attributable to Tutor Perini Corporation	$ (12,124)	$ 13,764
Weighted-average common shares outstanding, basic	49,814	49,282
Effect of dilutive restricted stock units and stock options		1,666
Weighted-average common shares outstanding, diluted	49,814	50,948
Net income (loss) attributable to Tutor Perini Corporation per common share: Basic	$ (0.24)	$ 0.28
Net income (loss) attributable to Tutor Perini Corporation per common share: Diluted	$ (0.24)	$ 0.27
Anti-dilutive securities not included above	4,507	930

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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