Share-Based Compensation (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grant (in shares)	987,001
Vested and expected to vest, outstanding, (in shares)	1,385,265
Total granted and outstanding (in shares)	1,435,265	1,625,265	2,167,765	2,275,265
Aggregate intrinsic value	$ 0
Weighted average remaining contractual term of outstanding stock options	2 years 10 months 24 days
Number of vested and exercisable stock options (in shares)	1,335,265
Stock options exercised, intrinsic value	$ 0
Vested and exercisable stock options, weighted average exercise price (in dollars per share)	$ 23.64
Weighted average remaining contractual term of outstanding stock options	2 years 7 months 6 days
Stock options granted but not vested (in shares)	100,000
Stock options granted, weighted-average exercise price (in dollars per share)	$ 19.24
Stock options granted, weighted-average remaining contractual life	7 years 2 months 12 days
Share-based compensation expense	$ 12,259,000	$ 9,065,000	$ 11,642,000
Share based compensation, tax benefits	300,000	900,000	1,200,000
Reduction in incremental cost	(500,000)
Modification of fair value, incremental cost	400,000
Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	10,500,000	7,400,000	10,000,000
Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1,700,000	$ 1,600,000	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)	50,000	125,000
Stock units with guaranteed minimum payouts outstanding, weighted-average grant date fair value (in dollars per share)	$ 26.32	$ 26.33
Stock units with guaranteed minimum payouts outstanding, recognized liabilities	$ 4,900,000	$ 2,100,000
Paid to settle share-based awards	2,800,000	3,600,000	300,000
Unrestricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of unrestricted stock units issued	$ 1,700,000	$ 1,800,000	$ 1,600,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units with guaranteed minimum payouts outstanding (in shares)	1,247,629	1,106,670	1,188,851	1,035,000
Stock units with guaranteed minimum payouts outstanding, weighted-average grant date fair value (in dollars per share)	$ 12.30	$ 15.66	$ 18.98	$ 21.85
Fair value of restricted stock units that vested during period	$ 4,100,000	$ 5,700,000	$ 5,300,000
Unamortized share-based compensation expense	$ 7,200,000
Weighted average period over which unrecognized compensation cost is expected to be recognized	1 year 7 months 6 days
Cash-settled Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units with guaranteed minimum payouts outstanding (in shares)	1,184,683	814,620	398,852	0
Stock units with guaranteed minimum payouts outstanding, weighted-average grant date fair value (in dollars per share)	$ 11.86	$ 16.61	$ 20.39	$ 0
Fair value of restricted stock units that vested during period	$ 1,100,000	$ 0	$ 0
Unamortized share-based compensation expense	$ 4,400,000
Weighted average period over which unrecognized compensation cost is expected to be recognized	1 year 10 months 24 days
Deferred Cash Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units with guaranteed minimum payouts outstanding (in shares)	284,379	100,000	0	0
Stock units with guaranteed minimum payouts outstanding, weighted-average grant date fair value (in dollars per share)	$ 7.87	$ 6.99	$ 0	$ 0
Fair value of restricted stock units that vested during period	$ 200,000	$ 0	$ 0
Unamortized share-based compensation expense	$ 1,600,000
Weighted average period over which unrecognized compensation cost is expected to be recognized	2 years 3 months 18 days
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)	2,682,894