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Other Comprehensive Income (Loss) (Schedule Of Tax Effects Of The Components Of Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Other Comprehensive Income (Loss) [Abstract] |  |
Defined benefit pension plan adjustments, Before-Tax Amount | $ 532 | $ 455
Defined benefit pension plan adjustments, Tax (Expense) Benefit | (151) | (187)
Defined benefit pension plan adjustments, Net-of-Tax Amount | 381 | 268
Foreign currency translation adjustments, Before-Tax Amount | (1,638) | (92)
Foreign currency translation adjustments, Tax (Expense) Benefit | 464 | 38
Foreign currency translation adjustments, Net-of-Tax Amount | (1,174) | (54)
Unrealized (loss) gain in fair value of investments, Before-Tax Amount | (119) | (36)
Unrealized (loss) gain in fair value of investments, Tax (Expense) Benefit | 34 | 15
Unrealized (loss) gain in fair value of investments, Net-of-Tax Amount | (85) | (21)
Total other comprehensive income (loss), Before-Tax Amount | (1,225) | 327
Total other comprehensive income (loss), Tax (Expense) Benefit | 347 | (134)
Total other comprehensive income (loss), Net-of-Tax Amount | (878) | 193
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount | (1,225) | 327
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit | 347 | (134)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | $ (878) | $ 193

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