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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Before-Tax Amount	$ 222	$ (3,444)	$ 2,662	$ (8,063)
Total other comprehensive income (loss), Tax (Expense) Benefit	10	453	(550)	1,583
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	232	(2,991)	2,112	(6,480)
Defined benefit pension plan adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Before-Tax Amount	411	638	826	1,277
Total other comprehensive income (loss), Tax (Expense) Benefit	(115)	(181)	(229)	(362)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	296	457	597	915
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Before-Tax Amount	562	(1,698)	902	(1,442)
Total other comprehensive income (loss), Tax (Expense) Benefit	(34)	308	(124)	309
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	528	(1,390)	778	(1,133)
Unrealized gain (loss) in fair value of investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Before-Tax Amount	(751)	(2,384)	934	(7,898)
Total other comprehensive income (loss), Tax (Expense) Benefit	159	326	(197)	1,636
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(592)	(2,058)	737	(6,262)
Less: Other comprehensive income (loss) attributable to noncontrolling interests
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), Before-Tax Amount	401	(773)	554	(1,152)
Total other comprehensive income (loss), Tax (Expense) Benefit	0	0	0	0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	401	(773)	554	(1,152)
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	(179)	(2,671)	2,108	(6,911)
Total other comprehensive income (loss), Tax (Expense) Benefit	10	453	(550)	1,583
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	$ (169)	$ (2,218)	$ 1,558	$ (5,328)