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Summary of Significant Accounting Policies (Tax Effects of Componenets of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of Significant Accounting Policies [Abstract] |  |  |  |
Defined benefit pension plan adjustments, Before-Tax Amount |  | $ 1,180 | $ 1,079 | $ 2,416
Defined benefit pension plan adjustments, Tax (Expense) Benefit |  | (336) | (308) | (992)
Defined benefit pension plan adjustments, Net-of-Tax Amount |  | 844 | 771 | 1,424
Foreign currency translation adjustment, Before-Tax Amount |  | 1,867 | (4,067) | 2,159
Foreign currency translation adjustment, Tax (Expense) Benefit |  | (530) | 1,122 | (886)
Foreign currency translation adjustment, Net-of-Tax Amount |  | 1,337 | (2,945) | 1,273
Unrealized gain (loss) in fair value of investments, Before-Tax Amount |  | 1,982 | (1,005) | (4)
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit |  | (421) | 227 | 2
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount |  | 1,561 | (778) | (2)
Total other comprehensive income (loss), Before-Tax Amount |  | 5,029 | (3,993) | 4,571
Total other comprehensive income (loss), Tax Benefit |  | (1,287) | 1,041 | (1,876)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX |  | 3,742 | (2,952) | 2,695
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Before-Tax Amount | [1] | 393 | (221) |
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Net-of-Tax Amount | [1] | 393 | (221) |
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount |  | 4,636 | (3,772) | 4,571
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit |  | (1,287) | 1,041 | (1,876)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAX |  | $ 3,349 | $ (2,731) | $ 2,695
[1] | The only component of other comprehensive income (loss) attributable to noncontrolling interests is foreign currency translation.

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