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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash payments related to share-based compensation $ 11,769 $ 584 $ 808  
Cash payments related to share-based compensation $ (11,769) (584) (808)  
Weighted average remaining contractual term of outstanding stock options 3 years 3 months 18 days      
Number of vested and exercisable stock options (in shares) 1,988,034      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 12,800      
Vested and exercisable stock options, weighted average exercise price (in dollars per share) $ 19.31      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 3 months 18 days      
Share-based compensation expense $ 21,174 13,423 9,477  
Share based compensation, tax benefits 8,700 6,100 4,600  
Employee [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 19,600 13,400 9,500  
Non-employee Directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 1,600 1,400 $ 1,500  
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for future grant (in shares) 214,000      
Units forfeited 20,985   281,560  
Expired or forfeited/cancelled, Weighted Average Grant Date Fair Value (in dollars per share) $ 23.91   $ 23.89  
Fair value of restricted stock units that vested during period $ 25,300 1,000 $ 8,000  
Aggregate intrinsic value 1,300 1,100    
Restricted stock expense $ 22,500      
Weighted average period over which unrecognized compensation cost is expected to be recognized 2 years 7 months 6 days      
Share based compensation, tax benefits $ 600 $ 500    
Granted, Weighted Average Grant Date Fair Value (in dollars per share) $ 30.02 $ 19.14 $ 23.07  
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for future grant (in shares) 194,000      
Options forfeited, Weighted Average Exercise Price $ 26.56   $ 15.97  
Stock option expense $ 3,700      
Weighted average period over which unrecognized compensation cost is expected to be recognized 2 years 2 months 12 days      
Total granted and outstanding (in shares) 2,554,034 2,174,500 1,998,000 1,989,000
Intrinsic value of outstanding stock options $ 13,600      
Weighted average remaining contractual term of outstanding stock options 4 years 4 months 24 days      
Stock options granted but not vested 566,000      
Stock options granted and expected to vest 527,816      
Stock options granted, intrinsic value $ 700      
Stock options granted, weighted-average exercise price $ 24.27      
Stock options granted, weighted-average remaining contractual life 8 years 2 months 12 days      
Granted, Grant Date Fair Value (in dollars per share) $ 13.11 $ 5.31 $ 12.48  
Granted (in shares) 539,000 274,000 259,000  
Unrestricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of unrestricted stock units issued $ 2,600 $ 1,400 $ 1,500  
Granted, Weighted Average Grant Date Fair Value (in dollars per share) $ 26.26 $ 21.67 $ 21.93  
Compensation Plan And Incentive Plan ("Plans") [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash payments related to share-based compensation $ 600      
Cash payments related to share-based compensation $ (600)      
Tutor Perini Corporation Incentive Compensation Plan (“Compensation Plan”) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for future grant (in shares) 1,554,364      
Tutor Perini Corporation Incentive Compensation Plan (“Compensation Plan”) [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options expiration period 10 years      
Number of shares authorized for grant 2,335,000      
Amended and Restated Tutor Perini Corporation Long-Term Incentive Plan (“Incentive Plan”)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for future grant (in shares) 405,529      
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 4,360,018