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Other Comprehensive Income (Loss) (Schedule of Components of Other Comprehensive Income (Loss) and Related Tax Effects) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount $ 6,200 $ (1,120) $ 4,976 $ 1,542
Total other comprehensive income (loss), Tax (Expense) Benefit (1,281) 147 (1,156) (403)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 4,919 (973) 3,820 1,139
Total other comprehensive income (loss) attributable to Tutor Perini Corporation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount 5,523 (647) 4,959 1,461
Total other comprehensive income (loss), Tax (Expense) Benefit (1,281) 147 (1,156) (403)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 4,242 (500) 3,803 1,058
Defined benefit pension plan adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount 282 413 1,157 1,239
Total other comprehensive income (loss), Tax (Expense) Benefit (75) (114) (308) (343)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 207 299 849 896
Foreign currency translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount 1,046 (1,204) (905) (302)
Total other comprehensive income (loss), Tax (Expense) Benefit (192) 187 129 63
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 854 (1,017) (776) (239)
Unrealized gain (loss) in fair value of investments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount 4,872 (329) 4,724 605
Total other comprehensive income (loss), Tax (Expense) Benefit (1,014) 74 (977) (123)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 3,858 (255) 3,747 482
Less: Other comprehensive income (loss) attributable to noncontrolling interests        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount 677 (473) 17 81
Total other comprehensive income (loss), Tax (Expense) Benefit 0 0 0 0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX $ 677 $ (473) $ 17 $ 81