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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Before-Tax Amount	$ (1,120)	$ (5,565)	$ 1,542	$ (13,628)
Total other comprehensive income (loss), Tax (Expense) Benefit	147	986	(403)	2,569
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(973)	(4,579)	1,139	(11,059)
Defined benefit pension plan adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Before-Tax Amount	413	639	1,239	1,916
Total other comprehensive income (loss), Tax (Expense) Benefit	(114)	(181)	(343)	(543)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	299	458	896	1,373
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Before-Tax Amount	(1,204)	(3,016)	(302)	(4,458)
Total other comprehensive income (loss), Tax (Expense) Benefit	187	489	63	798
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(1,017)	(2,527)	(239)	(3,660)
Unrealized gain (loss) in fair value of investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Before-Tax Amount	(329)	(3,188)	605	(11,086)
Total other comprehensive income (loss), Tax (Expense) Benefit	74	678	(123)	2,314
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(255)	(2,510)	482	(8,772)
Less: Other comprehensive loss attributable to noncontrolling interests
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Before-Tax Amount	(473)	(1,525)	81	(2,677)
Total other comprehensive income (loss), Tax (Expense) Benefit	0	0	0	0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(473)	(1,525)	81	(2,677)
Total other comprehensive income (loss) attributable to Tutor Perini Corporation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Before-Tax Amount	(647)	(4,040)	1,461	(10,951)
Total other comprehensive income (loss), Tax (Expense) Benefit	147	986	(403)	2,569
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	$ (500)	$ (3,054)	$ 1,058	$ (8,382)