Other Comprehensive Income (Loss) (Schedule Of Components Of Other Comprehensive Income (Loss) And Related Tax Effects) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Defined benefit pension plan adjustments, Before-Tax Amount	$ 683	$ 592	$ 1,366	$ 1,183
Defined benefit pension plan adjustments, Tax (Expense) Benefit	(192)	(168)	(383)	(336)
Defined benefit pension plan adjustments, Net-of-Tax Amount	(491)	(424)	(983)	(847)
Foreign currency translation adjustment, Before-Tax Amount	446	1,973	848	(2,954)
Foreign currency translation adjustment, Tax (Expense) Benefit	(46)	(318)	(76)	596
Foreign currency translation adjustment, Net-of-Tax Amount	400	1,655	772	(2,358)
Unrealized gain (loss) in fair value of investments, Before-Tax Amount	303	1,602	(1,247)	2,359
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit	(84)	(296)	283	(511)
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount	219	1,306	(964)	1,848
Total other comprehensive income (loss), Before-Tax Amount	1,432	4,167	967	588
Total other comprehensive income (loss), Tax Benefit (Expense)	(322)	(782)	(176)	(251)
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAX	1,110	3,385	791	337
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Before-Tax Amount	280	854	576	(1,166)
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Tax (Expense) Benefit	0	0	0	0
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Net-of-Tax Amount	280	854	576	(1,166)
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount	1,152	3,313	391	1,754
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit	(322)	(782)	(176)	(251)
Total other comprehensive income	$ 830	$ 2,531	$ 215	$ 1,503