Other Comprehensive Income (Loss) (Schedule Of Tax Effects Of The Components Of Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	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