Other Comprehensive Income (Loss) (Schedule Of Components Of Other Comprehensive Income (Loss) And Related Tax Effects) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Other Comprehensive Income (Loss) [Abstract]
Defined benefit pension plan adjustments, Before-Tax Amount		$ 591	$ 463
Defined benefit pension plan adjustments, Tax (Expense) Benefit		(168)	(133)
Defined benefit pension plan adjustments, Net-of-Tax Amount		423	330
Foreign currency translation adjustment, Before-Tax Amount		(4,927)	479
Foreign currency translation adjustment, Tax (Expense) Benefit		914	(131)
Foreign currency translation adjustment, Net-of-Tax Amount		(4,013)	348
Unrealized gain in fair value of investments, Before-Tax Amount		757	858
Unrealized gain in fair value of investments, Tax (Expense) Benefit		(215)	(185)
Unrealized gain in fair value of investments, Net-of-Tax Amount		542	673
Total other comprehensive income (loss), Before-Tax Amount		(3,579)	1,800
Total other comprehensive income (loss), Tax Benefit (Expense)		531	(449)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX		(3,048)	1,351
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Before-Tax Amount	[1]	(2,020)	102
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Tax (Expense) Benefit	[1]	0	0
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Net-of-Tax Amount	[1]	(2,020)	102
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount		(1,559)	1,698
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit		531	(449)
Total other comprehensive income (loss), Net of Tax		$ (1,028)	$ 1,249

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