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Other Comprehensive Income (Loss) (Schedule of Changes in AOCI Balances by Component (After-Tax)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period |  |  | $ 1,291,588 |
Balance at the beginning of the period, noncontrolling interests |  |  | (7,677) |
Other comprehensive income (loss) before reclassifications | $ 3,946 | $ (813) | 2,850 | $ 81
Amounts reclassified from AOCI | 296 | 313 | 953 | 977
Total other comprehensive income (loss) | 4,242 | (500) | 3,803 | 1,058
Other comprehensive income | 677 | (473) | 17 | 81
Balance at the end of the period, noncontrolling interests | 18,186 |  | 18,186 |
Balance at the end of the period | 1,213,503 |  | 1,213,503 |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period | (40,226) | (45,479) | (39,787) | (47,037)
Balance at the end of the period | (35,984) | (45,979) | (35,984) | (45,979)
Defined Benefit Pension Plan |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period | (28,712) | (32,040) | (29,354) | (32,637)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | 207 | 299 | 849 | 896
Total other comprehensive income (loss) | 207 | 299 | 849 | 896
Balance at the end of the period | (28,505) | (31,741) | (28,505) | (31,741)
Foreign Currency Translation |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period | (7,784) | (6,920) | (6,893) | (7,241)
Other comprehensive income (loss) before reclassifications | 535 | (484) | (356) | (163)
Amounts reclassified from AOCI | 0 | 0 | 0 | 0
Total other comprehensive income (loss) | 535 | (484) | (356) | (163)
Balance at the end of the period | (7,249) | (7,404) | (7,249) | (7,404)
Unrealized Gain (Loss) in Fair Value of Investments, Net |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period | (3,730) | (6,519) | (3,540) | (7,159)
Other comprehensive income (loss) before reclassifications | 3,411 | (329) | 3,206 | 244
Amounts reclassified from AOCI | 89 | 14 | 104 | 81
Total other comprehensive income (loss) | 3,500 | (315) | 3,310 | 325
Balance at the end of the period | (230) | (6,834) | (230) | (6,834)
AOCI Attributable to Noncontrolling Interest |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period, noncontrolling interests | (1,391) | (1,176) | (731) | (1,730)
Balance at the end of the period, noncontrolling interests | (714) | (1,649) | (714) | (1,649)
Defined Benefit Pension Plan |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period, noncontrolling interests | 0 | 0 | 0 | 0
Other comprehensive income | 0 | 0 | 0 | 0
Balance at the end of the period, noncontrolling interests | 0 | 0 | 0 | 0
Foreign Currency Translation |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period, noncontrolling interests | (1,051) | (342) | (312) | (799)
Other comprehensive income | 319 | (533) | (420) | (76)
Balance at the end of the period, noncontrolling interests | (732) | (875) | (732) | (875)
Unrealized Gain (Loss) in Fair Value of Investments, Net |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period, noncontrolling interests | (340) | (834) | (419) | (931)
Other comprehensive income | 358 | 60 | 437 | 157
Balance at the end of the period, noncontrolling interests | $ 18 | $ (774) | $ 18 | $ (774)

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