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, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Net income (loss) attributable to Tutor Perini Corporation	$ (210,009)	$ 91,925	$ 108,394
Weighted-average common shares outstanding, basic (in shares)	51,324	51,017	50,656
Effect of dilutive restricted stock units and stock options (in shares)	0	352	421
Weighted-average common shares outstanding, diluted (in shares)	51,324	51,369	51,077
Basic (in dollars per share)	$ (4.09)	$ 1.80	$ 2.14
Diluted (in dollars per share)	$ (4.09)	$ 1.79	$ 2.12
Anti-dilutive securities not included above (in shares)	3,163	1,892	1,862