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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period $ 1,239,819 $ 1,316,117 $ 1,158,606 $ 1,283,911
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX (268) 4,919 5,270 3,820
Balance at the end of the period 1,253,413 1,231,689 1,253,413 1,231,689
Accumulated Other Comprehensive Income (Loss)        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (30,244) (40,226) (33,988) (39,787)
Other comprehensive income (loss) before reclassifications 10 3,946 3,181 2,850
Amounts reclassified from AOCI 296 296 869 953
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 306 4,242 4,050 3,803
Balance at the end of the period (29,938) (35,984) (29,938) (35,984)
Defined Benefit Pension Plan        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (22,981) (28,712) (23,572) (29,354)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI 307 207 898 849
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 307 207 898 849
Balance at the end of the period (22,674) (28,505) (22,674) (28,505)
Foreign Currency Translation        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (7,430) (7,784) (8,657) (6,893)
Other comprehensive income (loss) before reclassifications (628) 535 599 (356)
Amounts reclassified from AOCI 0 0 0 0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX (628) 535 599 (356)
Balance at the end of the period (8,058) (7,249) (8,058) (7,249)
Unrealized Gain (Loss) in Fair Value of Investments, Net        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period 167 (3,730) (1,759) (3,540)
Other comprehensive income (loss) before reclassifications 638 3,411 2,582 3,206
Amounts reclassified from AOCI (11) 89 (29) 104
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 627 3,500 2,553 3,310
Balance at the end of the period 794 (230) 794 (230)
AOCI Attributable to Noncontrolling Interest        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period (689) (1,391) (2,483) (731)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX (574) 677 1,220 17
Balance at the end of the period (1,263) (714) (1,263) (714)
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 (837) (1,051) (2,423) (312)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX (629) 319 957 (420)
Balance at the end of the period (1,466) (732) (1,466) (732)
Unrealized Gain (Loss) in Fair Value of Investments, Net        
Attributable to Tutor Perini Corporation:        
Balance at the beginning of the period 148 (340) (60) (419)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX 55 358 263 437
Balance at the end of the period $ 203 $ 18 $ 203 $ 18