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Business Segments (Reportable Segments) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Revenue $ 1,082,816 $ 1,060,705 $ 3,259,273 $ 2,858,756
Loss from construction operations (106,807) (12,566) (17,508) (92,123)
Capital expenditures 6,914 14,967 28,266 45,590
Depreciation and amortization 13,510 11,231 41,098 31,985
Costs for share-based payment arrangements 16,500 3,500 39,000 9,100
Costs for share-based payment arrangements, after tax $ 12,100 $ 2,500 $ 28,600 $ 6,600
Costs for share-based payment arrangements, after tax (in dollars per share) $ 0.23 $ 0.05 $ 0.55 $ 0.13
Adverse Legal Ruling Pertaining to Mixed-Use Project in New York        
Segment Reporting Information [Line Items]        
Loss contingency       $ 83,600
Loss contingency, after tax       $ 60,100
Loss contingency, after tax, diluted (in dollars per share)       $ 1.16
Operating Segments        
Segment Reporting Information [Line Items]        
Revenue $ 1,127,427 $ 1,086,953 $ 3,391,687 $ 2,905,025
Loss from construction operations (73,351) 8,583 67,988 (34,318)
Capital expenditures 4,528 12,573 22,696 41,456
Depreciation and amortization 11,866 9,056 35,189 25,264
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenue (44,611) (26,248) (132,414) (46,269)
Corporate        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Loss from construction operations (33,456) (21,149) (85,496) (57,805)
Capital expenditures 2,386 2,394 5,570 4,134
Depreciation and amortization 1,644 2,175 5,909 6,721
Civil        
Segment Reporting Information [Line Items]        
Revenue 545,895 520,494 1,564,548 1,424,487
Civil | Unfavorable Adjustment Adverse Arbitration Ruling on Bridge Project in California        
Segment Reporting Information [Line Items]        
Revenue (79,400)   (79,400)  
Loss contingency 101,600   101,600  
Loss contingency, after tax $ 74,500   $ 74,500  
Loss contingency, after tax, diluted (in dollars per share) $ 1.42   $ 1.43  
Civil | Unfavorable Adjustment Legal Ruling Pertaining To Mass-Transit Project In California        
Segment Reporting Information [Line Items]        
Loss contingency   23,200   23,200
Loss contingency, after tax   $ 16,800   $ 16,800
Loss contingency, after tax, diluted (in dollars per share)   $ 0.32   $ 0.32
Civil | Favorable Adjustment Legal Settlement on Highway Tunneling Project in the West        
Segment Reporting Information [Line Items]        
Gain contingency $ 18,400      
Gain contingency, after tax $ 13,500      
Gain contingency, after tax, diluted (in dollars per share) $ 0.26      
Civil | Favorable Adjustment Legal Ruling Pertaining To Mass-Transit Project In California        
Segment Reporting Information [Line Items]        
Gain contingency   $ 8,800 $ 10,200 $ 25,600
Gain contingency, after tax   $ 7,000 $ 7,500 $ 20,300
Gain contingency, after tax, diluted (in dollars per share)   $ 0.13 $ 0.14 $ 0.39
Civil | Favorable Adjustment Legal Ruling Pertaining To Mass-Transit Project In California, Remaining Work        
Segment Reporting Information [Line Items]        
Gain contingency       $ 8,800
Gain contingency, after tax       $ 7,000
Gain contingency, after tax, diluted (in dollars per share)       $ 0.14
Civil | Unfavorable Adjustment Due To Highway Project In Northeast        
Segment Reporting Information [Line Items]        
Loss contingency     $ 12,400  
Loss contingency, after tax     $ 9,100  
Loss contingency, after tax, diluted (in dollars per share)     $ 0.17  
Civil | Favorable Adjustment Legal Settlement On Highway Tunneling Project In The Northwest        
Segment Reporting Information [Line Items]        
Gain contingency     $ 18,400  
Gain contingency, after tax     $ 13,500  
Gain contingency, after tax, diluted (in dollars per share)     $ 0.26  
Civil | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue $ 569,080 $ 543,776 $ 1,649,421 $ 1,477,553
Loss from construction operations (12,545) 46,889 133,785 170,308
Capital expenditures 4,237 11,941 21,847 36,649
Depreciation and amortization 10,718 7,698 31,699 21,753
Civil | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenue (23,185) (23,282) (84,873) (53,066)
Building        
Segment Reporting Information [Line Items]        
Revenue 435,715 365,449 1,265,523 926,444
Building | Unfavorable Adjustment Adverse Legal Settlement On Government Facility Project In Florida        
Segment Reporting Information [Line Items]        
Loss contingency 20,000   20,000  
Loss contingency, after tax $ 14,700   $ 14,700  
Loss contingency, after tax, diluted (in dollars per share) $ 0.28   $ 0.28  
Building | Adverse Legal Ruling Pertaining to Mixed-Use Project in New York        
Segment Reporting Information [Line Items]        
Loss contingency       72,200
Building | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue $ 457,141 368,244 $ 1,313,114 919,468
Loss from construction operations (3,895) 123 17,272 (83,917)
Capital expenditures 238 241 523 3,716
Depreciation and amortization 579 743 1,749 1,655
Building | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenue (21,426) (2,795) (47,591) 6,976
Specialty Contractors        
Segment Reporting Information [Line Items]        
Revenue 101,206 174,762 429,202 507,825
Specialty Contractors | Unfavorable Adjustment Legal Ruling Pertaining To Mass-Transit Project In California        
Segment Reporting Information [Line Items]        
Loss contingency 17,700 9,400 17,700 9,400
Loss contingency, after tax $ 13,000 $ 6,800 $ 13,000 $ 6,800
Loss contingency, after tax, diluted (in dollars per share) $ 0.25 $ 0.13 $ 0.25 $ 0.13
Specialty Contractors | Unfavorable Adjustment Legal Ruling Pertaining To Mass-Transit Project In New York        
Segment Reporting Information [Line Items]        
Loss contingency $ 11,500   $ 11,500  
Loss contingency, after tax $ 8,400   $ 8,400  
Loss contingency, after tax, diluted (in dollars per share) $ 0.16   $ 0.16  
Specialty Contractors | Unfavorable Adjustment due to Changes in Estimates on Transportation Project in the Northeast        
Segment Reporting Information [Line Items]        
Loss contingency   $ 16,900   $ 57,000
Loss contingency, after tax   $ 12,300   $ 41,400
Loss contingency, after tax, diluted (in dollars per share)   $ 0.24   $ 0.80
Specialty Contractors | Unfavorable Arbitration Ruling Pertaining to Electrical Project in New York        
Segment Reporting Information [Line Items]        
Loss contingency     $ 12,000  
Loss contingency, after tax     $ 8,800  
Loss contingency, after tax, diluted (in dollars per share)     $ 0.17  
Specialty Contractors | Adverse Legal Ruling Pertaining to Mixed-Use Project in New York        
Segment Reporting Information [Line Items]        
Loss contingency       $ 11,400
Specialty Contractors | Unfavorable Adjustment due to Educational Facilities Project in New York        
Segment Reporting Information [Line Items]        
Loss contingency       25,100
Loss contingency, after tax       $ 18,200
Loss contingency, after tax, diluted (in dollars per share)       $ 0.35
Specialty Contractors | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue $ 101,206 $ 174,933 $ 429,152 $ 508,004
Loss from construction operations (56,911) (38,429) (83,069) (120,709)
Capital expenditures 53 391 326 1,091
Depreciation and amortization 569 615 1,741 1,856
Specialty Contractors | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenue $ 0 (171) $ 50 (179)
Civil and Building | Unfavorable Adjustment due to Changes in Estimates on Transportation Project in the Northeast        
Segment Reporting Information [Line Items]        
Loss contingency   14,000   27,500
Loss contingency, after tax   $ 10,900   $ 21,400
Loss contingency, after tax, diluted (in dollars per share)   $ 0.21   $ 0.41