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Share-Based Compensation (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grant (in shares)	1,904,324
Vested and expected to vest, outstanding, (in shares)	676,633
Total granted and outstanding (in shares)	676,633	1,435,265	1,625,265	2,167,765
Aggregate intrinsic value	$ 600,000
Weighted average remaining contractual term of outstanding stock options	2 years 6 months
Stock options exercised, intrinsic value	$ 3,100,000
Share-based compensation expense	40,356,000	$ 12,259,000	$ 9,065,000
Share based compensation, tax benefits	$ 700,000	300,000	900,000
Reduction in incremental cost		500,000
Modification of fair value, incremental cost		400,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, achievement of target level performance criteria, payout range, percent
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, achievement of target level performance criteria, payout range, percent	250.00%
Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 38,800,000	10,500,000	7,400,000
Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1,500,000	$ 1,700,000	1,600,000
Restricted Stock Units, guaranteed minimum payouts
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units with guaranteed minimum payouts outstanding (in shares)	0	50,000
Stock units with guaranteed minimum payouts outstanding, weighted-average grant date fair value (in dollars per share)		$ 26.32
CPSUs, RSUs with guaranteed minimum payouts and CRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units with guaranteed minimum payouts outstanding, recognized liabilities	$ 34,600,000	$ 4,900,000
Paid to settle share-based awards	4,000,000.0	2,800,000	3,600,000
Unrestricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of unrestricted stock units issued	$ 1,500,000	$ 1,700,000	$ 1,800,000
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units with guaranteed minimum payouts outstanding (in shares)	628,716	1,247,629	1,106,670	1,188,851
Stock units with guaranteed minimum payouts outstanding, weighted-average grant date fair value (in dollars per share)	$ 10.57	$ 12.30	$ 15.66	$ 18.98
Fair value of restricted stock units that vested during period	$ 10,000,000.0	$ 4,100,000	$ 5,700,000
Unamortized share-based compensation expense	$ 2,500,000
Weighted average period over which unrecognized compensation cost is expected to be recognized	1 year 2 months 12 days
CPSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units with guaranteed minimum payouts outstanding (in shares)	1,514,095	1,184,683	814,620	398,852
Stock units with guaranteed minimum payouts outstanding, weighted-average grant date fair value (in dollars per share)	$ 14.34	$ 11.86	$ 16.61	$ 20.39
Fair value of restricted stock units that vested during period	$ 5,600,000	$ 1,100,000	$ 0
Unamortized share-based compensation expense	$ 24,400,000
Weighted average period over which unrecognized compensation cost is expected to be recognized	1 year 8 months 12 days
CRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units with guaranteed minimum payouts outstanding (in shares)	786,775	284,379	100,000	0
Stock units with guaranteed minimum payouts outstanding, weighted-average grant date fair value (in dollars per share)	$ 12.11	$ 7.87	$ 6.99	$ 0
Fair value of restricted stock units that vested during period	$ 3,000,000.0	$ 200,000	$ 0
Unamortized share-based compensation expense	$ 13,800,000
Weighted average period over which unrecognized compensation cost is expected to be recognized	2 years
Amended and Restated Tutor Perini Corporation Long-Term Incentive Plan (“Incentive Plan”) | Restricted Stock Units and Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested and expected to vest, outstanding, (in shares)	1,305,349

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