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Summary of Significant Accounting Policies (Tax Effects of Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |
Defined benefit pension plan adjustments, Before-Tax Amount | $ 8,665 | $ (8,700) | $ 1,180
Defined benefit pension plan adjustments, Tax (Expense) Benefit | (2,444) | 2,439 | (336)
Defined benefit pension plan adjustments, Net-of-Tax Amount | 6,221 | (6,261) | 844
Foreign currency translation adjustment, Before-Tax Amount | (508) | 178 | 1,867
Foreign currency translation adjustment, Tax (Expense) Benefit | 183 | 101 | (530)
Foreign currency translation adjustment, Net-of-Tax Amount | (325) | 279 | 1,337
Unrealized gain (loss) in fair value of investments, Before-Tax Amount | (3,440) | 2,015 | 1,982
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit | 790 | (444) | (421)
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount | (2,650) | 1,571 | 1,561
Total other comprehensive income (loss), Before-Tax Amount | 4,717 | (6,507) | 5,029
Total other comprehensive income (loss), Tax (Expense) Benefit | (1,471) | 2,096 | (1,287)
Total other comprehensive income (loss), Net-of-Tax Amount | 3,246 | (4,411) | 3,742
Less: Other comprehensive income attributable to noncontrolling interests, Before-Tax Amount | 140 | 230 | 393
Less: Other comprehensive income attributable to noncontrolling interest, Tax (Expense) Benefit | 0 | 0 | 0
Less: Other comprehensive income attributable to noncontrolling interests, Net-of-Tax Amount | 140 | 230 | 393
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount | 4,577 | (6,737) | 4,636
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit | (1,471) | 2,096 | (1,287)
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Net-of-Tax Amount | $ 3,106 | $ (4,641) | $ 3,349

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