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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

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