Other Comprehensive Income (Loss) (Schedule of Changes in AOCI Balances by Component (After-Tax)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	$ 1,291,588
Balance at the beginning of the period, noncontrolling interests	(7,677)
Other comprehensive income (loss) before reclassifications	(741)	$ 1,402
Amounts reclassified from AOCI	366	325
Total other comprehensive income	(375)	1,727
Other comprehensive income	(467)	153
Balance at the end of the period, noncontrolling interests	(3,802)
Balance at the end of the period	1,307,036
Accumulated Other Comprehensive Income (Loss)
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	(39,787)	(47,037)
Balance at the end of the period	(40,162)	(45,310)
Defined Benefit Pension Plan
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	(29,354)	(32,637)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI	321	301
Total other comprehensive income	321	301
Balance at the end of the period	(29,033)	(32,336)
Foreign Currency Translation
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	(6,893)	(7,241)
Other comprehensive income (loss) before reclassifications	(428)	231
Amounts reclassified from AOCI	0	0
Total other comprehensive income	(428)	231
Balance at the end of the period	(7,321)	(7,010)
Unrealized Gain (Loss) in Fair Value of Investments, Net
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	(3,540)	(7,159)
Other comprehensive income (loss) before reclassifications	(313)	1,171
Amounts reclassified from AOCI	45	24
Total other comprehensive income	(268)	1,195
Balance at the end of the period	(3,808)	(5,964)
AOCI Attributable to Noncontrolling Interest
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period, noncontrolling interests	(731)	(1,730)
Balance at the end of the period, noncontrolling interests	(1,198)	(1,577)
Defined Benefit Pension Plan
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period, noncontrolling interests	0	0
Other comprehensive income	0	0
Balance at the end of the period, noncontrolling interests	0	0
Foreign Currency Translation
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period, noncontrolling interests	(312)	(799)
Other comprehensive income	(499)	19
Balance at the end of the period, noncontrolling interests	(811)	(780)
Unrealized Gain (Loss) in Fair Value of Investments, Net
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period, noncontrolling interests	(419)	(931)
Other comprehensive income	32	134
Balance at the end of the period, noncontrolling interests	$ (387)	$ (797)