Summary of Significant Accounting Policies (Calculations of Basic and Diluted EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Net income (loss) attributable to Tutor Perini Corporation	$ (171,155)	$ (210,009)	$ 91,925
Weighted-average common shares outstanding, basic (in shares)	51,845	51,324	51,017
Effect of dilutive restricted stock units and stock options (in shares)	0	0	352
Weighted-average common shares outstanding, diluted (in shares)	51,845	51,324	51,369
Basic (in dollars per share)	$ (3.30)	$ (4.09)	$ 1.80
Diluted (in dollars per share)	$ (3.30)	$ (4.09)	$ 1.79
Anti-dilutive securities not included above (in shares)	2,982	3,163	1,892