Other Comprehensive Income (Loss) (Schedule Of Tax Effects Of The Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Other Comprehensive Income (Loss) [Abstract]
Defined benefit pension plan adjustments, Before-Tax Amount		$ 463	$ 532
Defined benefit pension plan adjustments, Tax (Expense) Benefit		(133)	(151)
Defined benefit pension plan adjustments, Net-of-Tax Amount		330	381
Foreign currency translation adjustments, Before-Tax Amount		479	(1,638)
Foreign currency translation adjustments, Tax (Expense) Benefit		(131)	464
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total		348	(1,174)
Unrealized gain (loss) in fair value of investments, Before-Tax Amount		858	(119)
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit		(185)	34
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount		673	(85)
Total other comprehensive income (loss), Before-Tax Amount		1,800	(1,225)
Total other comprehensive income (loss), Tax (Expense) Benefit		(449)	347
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX		1,351	(878)
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Before-of-Tax Amount	[1]	102
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Net-of-Tax Amount	[1]	102
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount		1,698	(1,225)
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit		(449)	347
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX		$ 1,249	$ (878)

[1] The only component of other comprehensive income attributable to noncontrolling interests is foreign currency translation.