Other Comprehensive Income (Loss) (Schedule Of Components Of Other Comprehensive Income (Loss) And Related Tax Effects) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Defined benefit pension plan adjustments, Before-Tax Amount	$ 639	$ 683	$ 1,916	$ 2,049
Defined benefit pension plan adjustments, Tax (Expense) Benefit	(181)	(191)	(543)	(574)
Defined benefit pension plan adjustments, Net-of-Tax Amount	458	492	1,373	1,475
Foreign currency translation adjustment, Before-Tax Amount	(3,016)	(1,389)	(4,458)	(541)
Foreign currency translation adjustment, Tax (Expense) Benefit	489	264	798	188
Foreign currency translation adjustment, Net-of-Tax Amount	(2,527)	(1,125)	(3,660)	(353)
Unrealized gain (loss) in fair value of investments, Before-Tax Amount	(3,188)	(581)	(11,086)	(1,828)
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit	678	133	2,314	416
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount	(2,510)	(448)	(8,772)	(1,412)
Total other comprehensive income (loss), Before-Tax Amount	(5,565)	(1,287)	(13,628)	(320)
Total other comprehensive income (loss), Tax Benefit (Expense)	986	206	2,569	30
TOTAL OTHER COMPREHENSIVE LOSS, NET OF TAX	(4,579)	(1,081)	(11,059)	(290)
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Before-Tax Amount	(1,525)	(447)	(2,677)	129
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	(1,525)	(447)	(2,677)	129
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount	(4,040)	(840)	(10,951)	(449)
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit	986	206	2,569	30
Total other comprehensive income (loss)	$ (3,054)	$ (634)	$ (8,382)	$ (419)