Other Comprehensive Income (Loss) (Schedule of Changes in AOCI Balances by Component (After-Tax)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 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	$ (355)	$ (508)	(1,096)	$ 894
Amounts reclassified from AOCI	291	339	657	664
Total other comprehensive income (loss)	(64)	(169)	(439)	1,558
Other comprehensive income (loss)	(193)	401	(660)	554
Balance at the end of the period, noncontrolling interests	6,162		6,162
Balance at the end of the period	1,309,955		1,309,955
Accumulated Other Comprehensive Income (Loss)
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	(40,162)	(45,310)	(39,787)	(47,037)
Balance at the end of the period	(40,226)	(45,479)	(40,226)	(45,479)
Defined Benefit Pension Plan
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	(29,033)	(32,336)	(29,354)	(32,637)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from AOCI	321	296	642	597
Total other comprehensive income (loss)	321	296	642	597
Balance at the end of the period	(28,712)	(32,040)	(28,712)	(32,040)
Foreign Currency Translation
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	(7,321)	(7,010)	(6,893)	(7,241)
Other comprehensive income (loss) before reclassifications	(463)	90	(891)	321
Amounts reclassified from AOCI	0	0	0	0
Total other comprehensive income (loss)	(463)	90	(891)	321
Balance at the end of the period	(7,784)	(6,920)	(7,784)	(6,920)
Unrealized Gain (Loss) in Fair Value of Investments, Net
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period	(3,808)	(5,964)	(3,540)	(7,159)
Other comprehensive income (loss) before reclassifications	108	(598)	(205)	573
Amounts reclassified from AOCI	(30)	43	15	67
Total other comprehensive income (loss)	78	(555)	(190)	640
Balance at the end of the period	(3,730)	(6,519)	(3,730)	(6,519)
AOCI Attributable to Noncontrolling Interest
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period, noncontrolling interests	(1,198)	(1,577)	(731)	(1,730)
Balance at the end of the period, noncontrolling interests	(1,391)	(1,176)	(1,391)	(1,176)
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)	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	(811)	(780)	(312)	(799)
Other comprehensive income (loss)	(240)	438	(739)	457
Balance at the end of the period, noncontrolling interests	(1,051)	(342)	(1,051)	(342)
Unrealized Gain (Loss) in Fair Value of Investments, Net
Attributable to Tutor Perini Corporation:
Balance at the beginning of the period, noncontrolling interests	(387)	(797)	(419)	(931)
Other comprehensive income (loss)	47	(37)	79	97
Balance at the end of the period, noncontrolling interests	$ (340)	$ (834)	$ (340)	$ (834)