Other Comprehensive Income (Loss) (Schedule Of Tax Effects Of The Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Comprehensive Income (Loss) [Abstract]
Defined benefit pension plan adjustments, Before-Tax Amount	$ 456	$ 427	$ 912	$ 853
Defined benefit pension plan adjustments, Tax (Expense) Benefit	(187)	(103)	(375)	(282)
Defined benefit pension plan adjustments, Net-of-Tax Amount	269	324	537	571
Foreign currency translation adjustments, Before-Tax Amount	1,101	(396)	1,009	1,208
Foreign currency translation adjustments, Tax (Expense) Benefit	(452)	138	(414)	(536)
Foreign currency translation adjustments, Net-of-Tax Amount	649	(258)	595	672
Unrealized (loss) gain in fair value of investments, Before-Tax Amount	(6)	(271)	(42)	(258)
Unrealized (loss) gain in fair value of investments, Tax (Expense) Benefit	3	118	18	113
Unrealized (loss) gain in fair value of investments, Net-of-Tax Amount	(3)	(153)	(24)	(145)
Unrealized loss in fair value of interest rate swap, Before-Tax Amount		17		(45)
Unrealized loss in fair value of interest rate swap, Tax (Expense) Benefit		(6)		21
Unrealized loss in fair value of interest rate swap, Net-of-Tax Amount		11		(24)
Total other comprehensive income (loss), Before-Tax Amount	1,551	(223)	1,879	1,758
Total other comprehensive income (loss), Tax (Expense) Benefit	(636)	147	(771)	(684)
Total other comprehensive income (loss), Net-of-Tax Amount	915	(76)	1,108	1,074
Other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount	1,551	(223)	1,879	1,758
Other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit	(636)	147	(771)	(684)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	$ 915	$ (76)	$ 1,108	$ 1,074