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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Paid to settle share-based awards $ 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 3 years 1 month 6 days      
Number of vested and exercisable stock options (in shares) 2,034,044      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 2,500      
Vested and exercisable stock options, weighted average exercise price (in dollars per share) $ 19.42      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 1 month 6 days      
Share-based compensation expense $ 22,782 21,174 $ 13,423  
Share based compensation, tax benefits 3,800 8,700 6,100  
Employee [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 21,100 19,600 13,400  
Non-employee Directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 1,700 1,600 1,400  
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate intrinsic value   1,300 1,100  
Fair value of restricted stock units that vested during period 7,900 25,300 1,000  
Restricted stock expense $ 21,400      
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) 160,000      
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options expiration period 10 years      
Number of shares available for future grant (in shares) 800,667      
Stock Options Exercises In Period Tax Benefit   $ 600 $ 500  
Stock option expense $ 6,000      
Weighted average period over which unrecognized compensation cost is expected to be recognized 2 years      
Total granted and outstanding (in shares) 2,943,044 2,554,034 2,174,500 1,998,000
Aggregate Intrinsic value $ 2,500      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   140,000 97,500  
Weighted average remaining contractual term of outstanding stock options 4 years 9 months 18 days      
Stock options granted but not vested 909,000      
Stock options granted and expected to vest 876,750      
Stock options granted, weighted-average exercise price $ 23.92      
Stock options granted, weighted-average remaining contractual life 8 years 6 months      
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) 160,000      
Unrestricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of unrestricted stock units issued $ 2,500 $ 2,600 $ 1,400  
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 4,732,044