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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summary of Significant Accounting Policies [Abstract] |  |  |
Defined benefit pension plan adjustments, Before-Tax Amount | $ 2,416 | $ (4,452) | $ 31
Defined benefit pension plan adjustments, Tax (Expense) Benefit | (992) | 1,829 | 1,995
Defined benefit pension plan adjustments, Net-of-Tax Amount | 1,424 | (2,623) | 2,026
Foreign currency translation adjustment, Before-Tax Amount | 2,159 | (439) | (5,897)
Foreign currency translation adjustment, Tax (Expense) Benefit | (886) | 178 | 2,683
Foreign currency translation adjustment, Net-of-Tax Amount | 1,273 | (261) | (3,214)
Unrealized (loss) gain in fair value of investments, Before-Tax Amount | (4) | (576) | 1,123
Unrealized (loss) gain in fair value of investments, Tax (Expense) Benefit | 2 | 236 | (357)
Unrealized (loss) gain in fair value of investments, Net-of-Tax Amount | (2) | (340) | 766
Unrealized loss in fair value of interest rate swap, Before-Tax Amount |  | (45) | (37)
Unrealized loss in fair value of interest rate swap, Tax (Expense) Benefit |  | 21 | (88)
Unrealized loss in fair value of interest rate swap, Net-of-Tax Amount |  | (24) | (125)
Total other comprehensive income (loss), Before-Tax Amount | 4,571 | (5,512) | (4,780)
Total other comprehensive income (loss), Tax Benefit | (1,876) | 2,264 | 4,233
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | 2,695 | (3,248) | (547)
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount | 4,571 | (5,512) | (4,780)
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit | (1,876) | 2,264 | 4,233
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAX | $ 2,695 | $ (3,248) | $ (547)

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