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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Defined benefit pension plan adjustments, Before-Tax Amount	$ 638	$ 683	$ 1,277	$ 1,366
Defined benefit pension plan adjustments, Tax (Expense) Benefit	(181)	(192)	(362)	(383)
Defined benefit pension plan adjustments, Net-of-Tax Amount	457	491	915	983
Foreign currency translation adjustment, Before-Tax Amount	(1,698)	446	(1,442)	848
Foreign currency translation adjustment, Tax (Expense) Benefit	308	(46)	309	(76)
Foreign currency translation adjustment, Net-of-Tax Amount	(1,390)	400	(1,133)	772
Unrealized gain (loss) in fair value of investments, Before-Tax Amount	(2,384)	303	(7,898)	(1,247)
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit	326	(84)	1,636	283
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount	(2,058)	219	(6,262)	(964)
Total other comprehensive income (loss), Before-Tax Amount	(3,444)	1,432	(8,063)	967
Total other comprehensive income (loss), Tax Benefit (Expense)	453	(322)	1,583	(176)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(2,991)	1,110	(6,480)	791
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Before-Tax Amount	(773)	280	(1,152)	576
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	(773)	280	(1,152)	576
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount	(2,671)	1,152	(6,911)	391
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit	453	(322)	1,583	(176)
Total other comprehensive income (loss)	$ (2,218)	$ 830	$ (5,328)	$ 215