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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
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of Significant Accounting Policies [Abstract] |  |  |  |
Defined benefit pension plan adjustments, Before-Tax Amount |  | $ 1,079 | $ 2,416 | $ (4,452)
Defined benefit pension plan adjustments, Tax (Expense) Benefit |  | (308) | (992) | 1,829
Defined benefit pension plan adjustments, Net-of-Tax Amount |  | 771 | 1,424 | (2,623)
Foreign currency translation adjustment, Before-Tax Amount |  | (4,067) | 2,159 | (439)
Foreign currency translation adjustment, Tax (Expense) Benefit |  | 1,122 | (886) | 178
Foreign currency translation adjustment, Net-of-Tax Amount |  | (2,945) | 1,273 | (261)
Unrealized gain (loss) in fair value of investments, Before-Tax Amount |  | (1,005) | (4) | (576)
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit |  | 227 | 2 | 236
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount |  | (778) | (2) | (340)
Unrealized gain (loss) in fair value of interest rate swap, Before-Tax Amount |  |  |  | (45)
Unrealized gain (loss) in fair value of interest rate swap, Tax (Expense) Benefit |  |  |  | 21
Unrealized gain (loss) in fair value of interest rate swap, Net-of-Tax Amount |  |  |  | (24)
Total other comprehensive income (loss), Before-Tax Amount |  | (3,993) | 4,571 | (5,512)
Total other comprehensive income (loss), Tax Benefit |  | 1,041 | (1,876) | 2,264
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX |  | (2,952) | 2,695 | (3,248)
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Before-Tax Amount | [1] | (221) |  |
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Net-of-Tax Amount | [1] | (221) |  |
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount |  | (3,772) | 4,571 | (5,512)
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit |  | 1,041 | (1,876) | 2,264
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAX |  | $ (2,731) | $ 2,695 | $ (3,248)
[1] | The only component of other comprehensive loss attributable to noncontrolling interests is foreign currency translation.

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