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Business Segments (Schedule of Reportable Segments) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Business Segments      
Revenue from external customers $ 4,326,922 $ 3,880,227 $ 3,790,755
Less: Segment expenses 4,430,675 3,994,824 3,995,519
Income (loss) from construction operations (103,753) (114,597) (204,764)
Capital expenditures 37,409 52,953 59,780
Depreciation and amortization 53,787 45,229 64,364
Costs for share-based payment arrangements 40,400 12,300 9,100
Costs for share-based payment arrangements, after tax $ 29,500 $ 9,000 $ 6,600
Costs for share-based payment arrangements, after tax (in dollars per share) $ 0.56 $ 0.17 $ 0.13
Operating Segments      
Business Segments      
Revenue from external customers $ 4,506,343 $ 3,967,868 $ 4,075,967
Less: Segment expenses 4,316,143 3,917,646 3,930,485
Income (loss) from construction operations 10,779 (37,419) (139,730)
Capital expenditures 28,183 46,500 54,697
Depreciation and amortization 47,124 36,357 54,934
Intersegment Eliminations      
Business Segments      
Revenue from external customers (179,421) (87,641) (285,212)
Segment Reporting, Reconciling Item, Corporate Nonsegment      
Business Segments      
Revenue from external customers 0 0 0
Less: Segment expenses 114,532 77,178 65,034
Income (loss) from construction operations (114,532) (77,178) (65,034)
Capital expenditures 9,226 6,453 5,083
Depreciation and amortization 6,663 8,872 9,430
Adverse Legal Ruling Pertaining to Mixed-Use Project in New York      
Business Segments      
Loss contingency   83,600  
Loss contingency, after tax   $ 60,800  
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share)   $ 1.17  
Civil      
Business Segments      
Revenue from external customers 2,118,953 $ 1,883,865 1,734,882
Loss contingency   40,700  
Civil | Operating Segments      
Business Segments      
Revenue from external customers 2,248,659 1,971,194 1,956,968
Less: Segment expenses 1,980,692 1,685,256 1,713,759
Income (loss) from construction operations 138,261 198,609 21,123
Capital expenditures 27,040 41,318 49,819
Depreciation and amortization 42,521 31,685 51,123
Civil | Intersegment Eliminations      
Business Segments      
Revenue from external customers (129,706) (87,329) (222,086)
Civil | Unfavorable Adjustment Adverse Arbitration Ruling on Bridge Project in California      
Business Segments      
Revenue from external customers (79,400)    
Loss contingency 101,600    
Loss contingency, after tax $ 74,300    
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share) $ 1.42    
Civil | Unfavorable Legal Ruling on a Completed Highway Project in Virginia      
Business Segments      
Loss contingency $ 17,400    
Loss contingency, after tax $ 12,700    
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share) $ 0.24    
Civil | Unfavourable Adjustments Due to Mass Transit Project in California      
Business Segments      
Loss contingency $ 15,100    
Loss contingency, after tax $ 11,100    
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share) $ 0.21    
Civil | Favorable Adjustment Legal Settlement on Highway Tunneling Project in the Western United States      
Business Segments      
Favorable arbitration $ 18,400    
Favorable arbitration, after tax $ 13,500    
Favorable arbitration, after tax, diluted (in dollars per share) $ 0.26    
Civil | Unfavorable Adjustment Legal Ruling Pertaining to Mass-Transit Project in California      
Business Segments      
Loss contingency   23,200  
Loss contingency, after tax   $ 17,000  
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share)   $ 0.33  
Civil | Favorable Adjustment Legal Ruling Pertaining to Mass-Transit Project in California, Remaining Work      
Business Segments      
Favorable arbitration   $ 8,800  
Favorable arbitration, after tax   $ 7,100  
Favorable arbitration, after tax, diluted (in dollars per share)   $ 0.14  
Civil | Favorable Adjustment Legal Ruling Pertaining to Mass-Transit Project in West Coast      
Business Segments      
Favorable arbitration   $ 19,000  
Favorable arbitration, after tax   $ 15,200  
Favorable arbitration, after tax, diluted (in dollars per share)   $ 0.29  
Civil | Favorable Adjustments Due to Improved Performance      
Business Segments      
Favorable arbitration   $ 58,100  
Civil | Unfavorable Legal Ruling Pertaining to Mass-Transit Project in West Coast      
Business Segments      
Loss contingency $ 31,800   38,800
Loss contingency, after tax $ 25,400   $ 30,700
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share) $ 0.48   $ 0.60
Civil | Unfavorable Adjustment Due to Highway Project in the Northeast      
Business Segments      
Loss contingency     $ 26,200
Loss contingency, after tax     $ 18,900
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share)     $ 0.37
Civil | Adverse Legal Ruling Pertaining to Bridge Project in New York      
Business Segments      
Loss contingency     $ 25,500
Loss contingency, after tax     $ 18,400
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share)     $ 0.36
Civil | Unfavorable Adjustments Due to Mass-transit Project in California      
Business Segments      
Loss contingency     $ 24,700
Loss contingency, after tax     $ 17,900
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share)     $ 0.35
Civil | Unfavorable Settlement due to Disputed Project in Maryland      
Business Segments      
Loss contingency     $ 16,200
Loss contingency, after tax     $ 11,700
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share)     $ 0.23
Building      
Business Segments      
Revenue from external customers $ 1,617,537 1,302,539 $ 1,242,571
Building | Operating Segments      
Business Segments      
Revenue from external customers 1,666,862 1,302,636 1,305,468
Less: Segment expenses 1,641,674 1,393,745 1,235,405
Income (loss) from construction operations (24,137) (91,206) 7,166
Capital expenditures 613 3,932 2,333
Depreciation and amortization 2,270 2,227 1,713
Building | Intersegment Eliminations      
Business Segments      
Revenue from external customers (49,325) (97) (62,897)
Building | Unfavourable Adjustments Due to Changes in Estimates on a Government Building Project in Florida      
Business Segments      
Loss contingency 25,900    
Favorable arbitration, after tax $ 18,900    
Favorable arbitration, after tax, diluted (in dollars per share) $ 0.36    
Building | Unfavorable Adjustment Adverse Legal Settlement on Government Facility Project in Florida      
Business Segments      
Loss contingency $ 20,000    
Favorable arbitration, after tax $ 14,600    
Favorable arbitration, after tax, diluted (in dollars per share) $ 0.28    
Building | Unfavorable Adjustment on a Government Building Project in Florida      
Business Segments      
Loss contingency   14,600  
Loss contingency, after tax   $ 10,700  
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share)   $ 0.21  
Building | Adverse Legal Ruling Pertaining to Mixed-Use Project in New York      
Business Segments      
Loss contingency   $ 72,200  
Specialty Contractors      
Business Segments      
Revenue from external customers $ 590,432 693,823 813,302
Specialty Contractors | Operating Segments      
Business Segments      
Revenue from external customers 590,822 694,038 813,531
Less: Segment expenses 693,777 838,645 981,321
Income (loss) from construction operations (103,345) (144,822) (168,019)
Capital expenditures 530 1,250 2,545
Depreciation and amortization 2,333 2,445 2,098
Specialty Contractors | Intersegment Eliminations      
Business Segments      
Revenue from external customers (390) (215) (229)
Specialty Contractors | Unfavorable Adjustment Legal Ruling Pertaining to Mass-Transit Project in California      
Business Segments      
Loss contingency 17,700    
Loss contingency, after tax $ 13,000    
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share) $ 0.25    
Specialty Contractors | Unfavorable Adjustment Due to Changes in Estimates on Transportation Project in the Northeast      
Business Segments      
Loss contingency   62,200  
Loss contingency, after tax   $ 45,700  
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share)   $ 0.88  
Specialty Contractors | Unfavorable Adjustment Due to Educational Facilities Project in New York      
Business Segments      
Loss contingency   $ 24,700  
Loss contingency, after tax   $ 18,100  
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share)   $ 0.35  
Specialty Contractors | Unfavorable Adjustment on Multi-Unit Residential Project in New York      
Business Segments      
Loss contingency   $ 16,900  
Loss contingency, after tax   $ 12,400  
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share)   $ 0.24  
Specialty Contractors | Adverse Legal Ruling Pertaining to Mixed-Use Project in New York      
Business Segments      
Loss contingency   $ 11,400  
Specialty Contractors | Unfavorable Adjustment Due to Transportation Project in the Northeast      
Business Segments      
Loss contingency     46,200
Loss contingency, after tax     $ 33,500
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share)     $ 0.65
Specialty Contractors | Unfavorable Non-Cash Adjustment Due to Appellate Court Decision Involving a Completed Mass-Transit Project in New York      
Business Segments      
Loss contingency     $ 43,200
Loss contingency, after tax     $ 31,400
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share)     $ 0.61
Specialty Contractors | Legal Appeal Due to Electrical Project in the New York      
Business Segments      
Loss contingency     $ 17,800
Loss contingency, after tax     $ 12,900
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share)     $ 0.25
Civil and Building | Unfavorable Adjustment Due to Changes in Estimates on Transportation Project in the Northeast      
Business Segments      
Loss contingency   28,300 $ 31,400
Loss contingency, after tax   $ 22,200 $ 24,400
Loss contingency, loss in period, after tax, per share, diluted (in dollars per share)   $ 0.43 $ 0.48