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Other Comprehensive Income (Loss) (Schedule of Changes in AOCI Balances by Component (After-Tax)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period     $ 1,291,588  
Balance at the beginning of the period, noncontrolling interests     (7,677)  
Other comprehensive income (loss) before reclassifications $ 3,946 $ (813) 2,850 $ 81
Amounts reclassified from AOCI 296 313 953 977
Total other comprehensive income (loss) 4,242 (500) 3,803 1,058
Other comprehensive income 677 (473) 17 81
Balance at the end of the period, noncontrolling interests 18,186   18,186  
Balance at the end of the period 1,213,503   1,213,503  
Accumulated Other Comprehensive Income (Loss)        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (40,226) (45,479) (39,787) (47,037)
Balance at the end of the period (35,984) (45,979) (35,984) (45,979)
Defined Benefit Pension Plan        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (28,712) (32,040) (29,354) (32,637)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI 207 299 849 896
Total other comprehensive income (loss) 207 299 849 896
Balance at the end of the period (28,505) (31,741) (28,505) (31,741)
Foreign Currency Translation        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (7,784) (6,920) (6,893) (7,241)
Other comprehensive income (loss) before reclassifications 535 (484) (356) (163)
Amounts reclassified from AOCI 0 0 0 0
Total other comprehensive income (loss) 535 (484) (356) (163)
Balance at the end of the period (7,249) (7,404) (7,249) (7,404)
Unrealized Gain (Loss) in Fair Value of Investments, Net        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (3,730) (6,519) (3,540) (7,159)
Other comprehensive income (loss) before reclassifications 3,411 (329) 3,206 244
Amounts reclassified from AOCI 89 14 104 81
Total other comprehensive income (loss) 3,500 (315) 3,310 325
Balance at the end of the period (230) (6,834) (230) (6,834)
AOCI Attributable to Noncontrolling Interest        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period, noncontrolling interests (1,391) (1,176) (731) (1,730)
Balance at the end of the period, noncontrolling interests (714) (1,649) (714) (1,649)
Defined Benefit Pension Plan        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period, noncontrolling interests 0 0 0 0
Other comprehensive income 0 0 0 0
Balance at the end of the period, noncontrolling interests 0 0 0 0
Foreign Currency Translation        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period, noncontrolling interests (1,051) (342) (312) (799)
Other comprehensive income 319 (533) (420) (76)
Balance at the end of the period, noncontrolling interests (732) (875) (732) (875)
Unrealized Gain (Loss) in Fair Value of Investments, Net        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period, noncontrolling interests (340) (834) (419) (931)
Other comprehensive income 358 60 437 157
Balance at the end of the period, noncontrolling interests $ 18 $ (774) $ 18 $ (774)