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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period     $ 1,449,718  
Balance at the beginning of the period, noncontrolling interests     (7,734)  
Other comprehensive income (loss) before reclassifications $ (813) $ (3,575) 81 $ (9,851)
Amounts reclassified from AOCI 313 521 977 1,469
Total other comprehensive income (loss) (500) (3,054) 1,058 (8,382)
Other comprehensive income (loss) (473) (1,525) 81 (2,677)
Balance at the end of the period, noncontrolling interests 2,454   2,454  
Balance at the end of the period 1,331,501   1,331,501  
Defined Benefit Pension Plan        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (32,040) (36,951) (32,637) (37,866)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI 299 458 896 1,373
Total other comprehensive income (loss) 299 458 896 1,373
Balance at the end of the period (31,741) (36,493) (31,741) (36,493)
Foreign Currency Translation        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (6,920) (6,568) (7,241) (5,787)
Other comprehensive income (loss) before reclassifications (484) (1,238) (163) (2,019)
Amounts reclassified from AOCI 0 0 0 0
Total other comprehensive income (loss) (484) (1,238) (163) (2,019)
Balance at the end of the period (7,404) (7,806) (7,404) (7,806)
Unrealized Gain (Loss) in Fair Value of Investments, Net        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (6,519) (5,444) (7,159) 18
Other comprehensive income (loss) before reclassifications (329) (2,337) 244 (7,832)
Amounts reclassified from AOCI 14 63 81 96
Total other comprehensive income (loss) (315) (2,274) 325 (7,736)
Balance at the end of the period (6,834) (7,718) (6,834) (7,718)
Accumulated Other Comprehensive Income (Loss)        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (45,479) (48,963) (47,037) (43,635)
Balance at the end of the period (45,979) (52,017) (45,979) (52,017)
AOCI Attributable to Noncontrolling Interest        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period, noncontrolling interests (1,176) (610) (1,730) 542
Balance at the end of the period, noncontrolling interests (1,649) (2,135) (1,649) (2,135)
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 (loss) 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 (342) 190 (799) 542
Other comprehensive income (loss) (533) (1,289) (76) (1,641)
Balance at the end of the period, noncontrolling interests (875) (1,099) (875) (1,099)
Unrealized Gain (Loss) in Fair Value of Investments, Net        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period, noncontrolling interests (834) (800) (931) 0
Other comprehensive income (loss) 60 (236) 157 (1,036)
Balance at the end of the period, noncontrolling interests $ (774) $ (1,036) $ (774) $ (1,036)