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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount $ (204) $ 6,200 $ 6,545 $ 4,976
Total other comprehensive income (loss), Tax Expense (64) (1,281) (1,275) (1,156)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX (268) 4,919 5,270 3,820
Total other comprehensive income attributable to Tutor Perini Corporation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount 370 5,523 5,325 4,959
Total other comprehensive income (loss), Tax Expense (64) (1,281) (1,275) (1,156)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 306 4,242 4,050 3,803
Defined benefit pension plan adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount 420 282 1,228 1,157
Total other comprehensive income (loss), Tax Expense (113) (75) (330) (308)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 307 207 898 849
Foreign currency translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount (1,488) 1,046 1,776 (905)
Total other comprehensive income (loss), Tax Expense 231 (192) (220) 129
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX (1,257) 854 1,556 (776)
Unrealized gain in fair value of investments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount 864 4,872 3,541 4,724
Total other comprehensive income (loss), Tax Expense (182) (1,014) (725) (977)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 682 3,858 2,816 3,747
Less: Other comprehensive income (loss) attributable to noncontrolling interests        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount (574) 677 1,220 17
Total other comprehensive income (loss), Tax Expense 0 0 0 0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX $ (574) $ 677 $ 1,220 $ 17