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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount $ 3,905 $ (278) $ 6,749 $ (1,224)
Total other comprehensive income (loss), Tax Expense (643) 21 (1,211) 125
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 3,262 (257) 5,538 (1,099)
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 2,589 (85) 4,955 (564)
Total other comprehensive income (loss), Tax Expense (643) 21 (1,211) 125
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 1,946 (64) 3,744 (439)
Defined benefit pension plan adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount 395 438 808 875
Total other comprehensive income (loss), Tax Expense (106) (117) (217) (233)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 289 321 591 642
Foreign currency translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount 2,477 (869) 3,264 (1,951)
Total other comprehensive income (loss), Tax Expense (333) 166 (451) 321
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 2,144 (703) 2,813 (1,630)
Unrealized gain (loss) in fair value of investments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount 1,033 153 2,677 (148)
Total other comprehensive income (loss), Tax Expense (204) (28) (543) 37
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 829 125 2,134 (111)
Less: Other comprehensive income (loss) attributable to noncontrolling interests        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total other comprehensive income (loss), Before-Tax Amount 1,316 (193) 1,794 (660)
Total other comprehensive income (loss), Tax Expense 0 0 0 0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX $ 1,316 $ (193) $ 1,794 $ (660)