Other Comprehensive Income (Loss) (Schedule Of Changes In AOCI Balances By Component (After-Tax)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period			$ 1,654,921
Balance at the beginning of the period, noncontrolling interests			18,799
Other comprehensive income (loss) before reclassifications	$ (3,575)	$ (1,069)	(9,851)	$ (1,700)
Amounts reclassified from AOCI	521	435	1,469	1,281
Total other comprehensive income (loss)	(3,054)	(634)	(8,382)	(419)
Other comprehensive income (loss) attributable to noncontrolling interests	(1,525)	(447)	(2,677)	129
Balance at the end of the period, noncontrolling interests	(17,228)		(17,228)
Balance at the end of the period	1,536,591		1,536,591
Defined Benefit Pension Plan
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	(36,951)	(43,104)	(37,866)	(44,087)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from AOCI	458	492	1,373	1,475
Total other comprehensive income (loss)	458	492	1,373	1,475
Balance at the end of the period	(36,493)	(42,612)	(36,493)	(42,612)
Foreign Currency Translation
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	(6,568)	(5,126)	(5,787)	(5,322)
Other comprehensive income (loss) before reclassifications	(1,238)	(678)	(2,019)	(482)
Amounts reclassified from AOCI	0	0	0	0
Total other comprehensive income (loss)	(1,238)	(678)	(2,019)	(482)
Balance at the end of the period	(7,806)	(5,804)	(7,806)	(5,804)
Unrealized Gain (Loss) in Fair Value of Investments, Net
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	(5,444)	1,704	18	2,668
Other comprehensive income (loss) before reclassifications	(2,337)	(391)	(7,832)	(1,218)
Amounts reclassified from AOCI	63	(57)	96	(194)
Total other comprehensive income (loss)	(2,274)	(448)	(7,736)	(1,412)
Balance at the end of the period	(7,718)	1,256	(7,718)	1,256
Accumulated Other Comprehensive Income (Loss)
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	(48,963)	(46,526)	(43,635)	(46,741)
Balance at the end of the period	(52,017)	(47,160)	(52,017)	(47,160)
AOCI Attributable to Noncontrolling Interest
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period, noncontrolling interests	(610)	978	542	402
Balance at the end of the period, noncontrolling interests	(2,135)	531	(2,135)	531
Defined Benefit Pension Plan
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period, noncontrolling interests	0	0	0	0
Other comprehensive income (loss) attributable to noncontrolling interests	0	0	0	0
Balance at the end of the period, noncontrolling interests	0	0	0	0
Foreign Currency Translation
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period, noncontrolling interests	190	978	542	402
Other comprehensive income (loss) attributable to noncontrolling interests	(1,289)	(447)	(1,641)	129
Balance at the end of the period, noncontrolling interests	(1,099)	531	(1,099)	531
Unrealized Gain (Loss) in Fair Value of Investments, Net
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period, noncontrolling interests	(800)	0	0	0
Other comprehensive income (loss) attributable to noncontrolling interests	(236)	0	(1,036)	0
Balance at the end of the period, noncontrolling interests	$ (1,036)	$ 0	$ (1,036)	$ 0