Other Comprehensive Income (Loss) (Schedule Of Tax Effects Of The Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Comprehensive Income (Loss) [Abstract]
Defined benefit pension plan adjustments, Before-Tax Amount	$ 456	$ 427	$ 1,368	$ 1,280
Defined benefit pension plan adjustments, Tax (Expense) Benefit	(187)	(179)	(562)	(461)
Defined benefit pension plan adjustments, Net-of-Tax Amount	269	248	806	819
Foreign currency translation adjustments, Before-Tax Amount	1,232	(708)	2,242	500
Foreign currency translation adjustments, Tax (Expense) Benefit	(506)	297	(921)	(239)
Foreign currency translation adjustments, Net-of-Tax Amount	726	(411)	1,321	261
Unrealized loss in fair value of investments, Before-Tax Amount	21	(145)	(20)	(403)
Unrealized loss in fair value of investments, Tax (Expense) Benefit	(9)	66	8	179
Unrealized loss in fair value of investments, Net-of-Tax Amount	12	(79)	(12)	(224)
Unrealized (loss) gain in fair value of interest rate swap, Before-Tax Amount				(45)
Unrealized (loss) gain in fair value of interest rate swap, Tax (Expense) Benefit				21
Unrealized (loss) gain in fair value of interest rate swap, Net-of-Tax Amount				(24)
Total other comprehensive income (loss), Before-Tax Amount	1,709	(426)	3,590	1,332
Total other comprehensive income (loss), Tax (Expense) Benefit	(702)	184	(1,475)	(500)
Total other comprehensive income (loss), Net-of-Tax Amount	1,007	(242)	2,115	832
Other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount	1,709	(426)	3,590	1,332
Other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit	(702)	184	(1,475)	(500)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	$ 1,007	$ (242)	$ 2,115	$ 832