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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period $ 1,187,597 $ 1,303,234 $ 1,158,606 $ 1,283,911
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 3,262 (257) 5,538 (1,099)
Balance at the end of the period 1,239,819 1,316,117 1,239,819 1,316,117
Accumulated Other Comprehensive Income (Loss)        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (32,190) (40,162) (33,988) (39,787)
Other comprehensive income before reclassifications 1,657 (355) 3,171 (1,096)
Amounts reclassified from AOCI 289 291 573 657
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 1,946 (64) 3,744 (439)
Balance at the end of the period (30,244) (40,226) (30,244) (40,226)
Defined Benefit Pension Plan        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (23,270) (29,033) (23,572) (29,354)
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from AOCI 289 321 591 642
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 289 321 591 642
Balance at the end of the period (22,981) (28,712) (22,981) (28,712)
Foreign Currency Translation        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (8,344) (7,321) (8,657) (6,893)
Other comprehensive income before reclassifications 914 (463) 1,227 (891)
Amounts reclassified from AOCI 0 0 0 0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 914 (463) 1,227 (891)
Balance at the end of the period (7,430) (7,784) (7,430) (7,784)
Unrealized Gain (Loss) in Fair Value of Investments, Net        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (576) (3,808) (1,759) (3,540)
Other comprehensive income before reclassifications 743 108 1,944 (205)
Amounts reclassified from AOCI 0 (30) (18) 15
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 743 78 1,926 (190)
Balance at the end of the period 167 (3,730) 167 (3,730)
AOCI Attributable to Noncontrolling Interest        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (2,005) (1,198) (2,483) (731)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 1,316 (193) 1,794 (660)
Balance at the end of the period (689) (1,391) (689) (1,391)
Defined Benefit Pension Plan        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period 0 0 0 0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 0 0 0 0
Balance at the end of the period 0 0 0 0
Foreign Currency Translation        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (2,067) (811) (2,423) (312)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 1,230 (240) 1,586 (739)
Balance at the end of the period (837) (1,051) (837) (1,051)
Unrealized Gain (Loss) in Fair Value of Investments, Net        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period 62 (387) (60) (419)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 86 47 208 79
Balance at the end of the period $ 148 $ (340) $ 148 $ (340)