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, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Defined benefit pension plan adjustments, Before-Tax Amount	$ 683	$ 591
Defined benefit pension plan adjustments, Tax (Expense) Benefit	(191)	(168)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Net-of-Tax, Total	(492)	(423)
Foreign currency translation adjustment, Before-Tax Amount	402	(4,927)
Foreign currency translation adjustment, Tax (Expense) Benefit	(30)	914
Foreign currency translation adjustment, Net-of-Tax Amount	372	(4,013)
Unrealized gain (loss) in fair value of investments, Before-Tax Amount	(1,550)	757
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit	367	(215)
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount	(1,183)	542
Total other comprehensive income (loss), Before-Tax Amount	(465)	(3,579)
Total other comprehensive income (loss), Tax Benefit (Expense)	146	531
TOTAL OTHER COMPREHENSIVE LOSS, NET OF TAX	(319)	(3,048)
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Before-Tax Amount	296	(2,020)
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Tax (Expense) Benefit	0	0
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Net-of-Tax Amount	296	(2,020)
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount	(761)	(1,559)
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit	146	531
Total other comprehensive income (loss)	$ (615)	$ (1,028)