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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

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