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Summary of Significant Accounting Policies (Schedule of Calculations of Basic and Diluted EPS) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounting Policies [Abstract]      
Net loss attributable to Tutor Perini Corporation $ (163,721) $ (171,155) $ (210,009)
Weighted-average common shares outstanding, basic (in shares) 52,322 51,845 51,324
Effect of dilutive restricted stock units and stock options (in shares) 0 0 0
Weighted-average common shares outstanding, diluted (in shares) 52,322 51,845 51,324
Basic (in dollars per share) $ (3.13) $ (3.30) $ (4.09)
Diluted (in dollars per share) $ (3.13) $ (3.30) $ (4.09)
Anti-dilutive securities not included above (in shares) 1,443 2,982 3,163