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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized for grant 1,241,879      
Paid to settle share-based awards $ 0 $ 0 $ 600  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0      
Weighted average remaining contractual term of outstanding stock options 4 years 1 month 6 days      
Number of vested and exercisable stock options (in shares) 1,509,015      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 900      
Vested and exercisable stock options, weighted average exercise price (in dollars per share) $ 19.69      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 4 years 1 month 6 days      
Share-based compensation expense $ 19,143 22,782 21,174  
Share based compensation, tax benefits 2,900 3,800 8,700  
Employee [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 17,500 21,100 19,600  
Non-employee Directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 1,600 1,700 1,600  
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of restricted stock units that vested during period 3,100 $ 7,900 25,300  
Restricted stock expense $ 17,300      
Weighted average period over which unrecognized compensation cost is expected to be recognized 2 years      
Restricted Stock Units [Member] | Granted In 2019 And 2020 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for future grant (in shares) 75,000      
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options expiration period 10 years      
Aggregate intrinsic value     1,300  
Stock Options Exercises In Period Tax Benefit     $ 600  
Stock option expense $ 3,600      
Weighted average period over which unrecognized compensation cost is expected to be recognized 1 year 9 months 18 days      
Total granted and outstanding (in shares) 2,279,015 2,943,044 2,554,034 2,174,500
Aggregate Intrinsic value $ 900      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     140,000  
Weighted average remaining contractual term of outstanding stock options 5 years 6 months      
Stock options granted but not vested 770,000      
Stock options granted and expected to vest 770,000      
Stock options granted, weighted-average exercise price $ 22.44      
Stock options granted, weighted-average remaining contractual life 8 years 4 months 24 days      
Stock Options [Member] | Granted In 2019 And 2020 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for future grant (in shares) 75,000      
Unrestricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of unrestricted stock units issued $ 1,500 $ 2,500 $ 2,600  
Amended and Restated Tutor Perini Corporation Long-Term Incentive Plan (“Incentive Plan”) | Restricted Stock Units And Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate number of shares outstanding, historical awards that either have not vested or have vested but not exercised 4,144,015