Summary of Significant Accounting Policies (Schedule of Reclassification from AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	$ 27,512	$ 19,878	$ 17,200
Income tax (expense) benefit	(61,427)	50,669	54,957
NET INCOME (LOSS) ATTRIBUTABLE TO TUTOR PERINI CORPORATION	80,440	(163,721)	(171,155)
Reclassification out of Accumulated Other Comprehensive Income | Component of AOCI:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	2,072	1,664	1,700
Income tax (expense) benefit	(568)	(448)	(453)
NET INCOME (LOSS) ATTRIBUTABLE TO TUTOR PERINI CORPORATION	1,504	1,216	1,247
Reclassification out of Accumulated Other Comprehensive Income | Unrealized (gain) loss in fair value of investment adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	(65)	128	115
Income tax (expense) benefit	14	(27)	(24)
NET INCOME (LOSS) ATTRIBUTABLE TO TUTOR PERINI CORPORATION	$ (51)	$ 101	$ 91