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Business Segments (Schedule of Reportable Segments) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Revenue $ 1,415,360 $ 1,082,816 $ 4,035,674 $ 3,259,273
Cost of operations 1,245,965 1,108,644 3,535,883 3,052,773
General and administrative expenses 129,301 80,979 317,942 224,008
Income (loss) from construction operations 40,094 (106,807) 181,849 (17,508)
Capital expenditures 48,951 6,914 105,891 28,266
Depreciation and amortization 12,212 13,510 37,687 41,098
Costs for share-based payment arrangements 58,700 16,500 120,700 39,000
Costs for share-based payment arrangements, after tax $ 58,300 $ 16,400 $ 119,800 $ 38,500
Costs for share-based payment arrangements, after tax, diluted (in dollars per share) $ 1.08 $ 0.31 $ 2.25 $ 0.73
Operating Segments        
Segment Reporting Information [Line Items]        
Revenue $ 1,497,361 $ 1,127,427 $ 4,255,558 $ 3,391,687
Cost of operations 1,245,965 1,107,736 3,535,848 3,051,115
General and administrative expenses 49,628 48,431 152,562 140,170
Income (loss) from construction operations 119,767 (73,351) 347,264 67,988
Capital expenditures 47,722 4,528 102,768 22,696
Depreciation and amortization 11,888 11,866 36,001 35,189
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenue (82,001) (44,611) (219,884) (132,414)
Corporate        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Cost of operations 0 908 35 1,658
General and administrative expenses 79,673 32,548 165,380 83,838
Income (loss) from construction operations (79,673) (33,456) (165,415) (85,496)
Capital expenditures 1,229 2,386 3,123 5,570
Depreciation and amortization 324 1,644 1,686 5,909
Civil        
Segment Reporting Information [Line Items]        
Revenue 770,234 545,895 2,114,462 1,564,548
Civil | Favorable Adjustment Legal Ruling Pertaining to Mass-Transit Project In Midwest        
Segment Reporting Information [Line Items]        
Gain contingency     28,000  
Gain contingency, after tax     $ 20,300  
Gain contingency, after tax, diluted (in dollars per share)     $ 0.38  
Civil | Unfavorable Adjustment Due to Arbitration Ruling on Bridge Project in California        
Segment Reporting Information [Line Items]        
Revenue   79,400   79,400
Loss contingency, loss in period   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 | Favorable Adjustment Legal Settlement on Highway Tunneling Project in the Western United States        
Segment Reporting Information [Line Items]        
Gain contingency   $ 18,400   $ 18,400
Gain contingency, after tax   $ 13,500   $ 13,500
Gain contingency, after tax, diluted (in dollars per share)   $ 0.26   $ 0.26
Civil | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 832,966 $ 569,080 $ 2,262,584 $ 1,649,421
Cost of operations 649,094 536,854 1,727,984 1,368,736
General and administrative expenses 21,988 21,586 67,611 62,027
Income (loss) from construction operations 99,152 (12,545) 318,867 133,785
Capital expenditures 45,982 4,237 97,390 21,847
Depreciation and amortization 10,724 10,718 32,492 31,699
Civil | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenue (62,732) (23,185) (148,122) (84,873)
Building        
Segment Reporting Information [Line Items]        
Revenue 418,664 435,715 1,340,530 1,265,523
Building | Unfavorable Adjustment Adverse Legal Settlement on Government Facility Project in Florida        
Segment Reporting Information [Line Items]        
Loss contingency, loss in period   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 | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 437,933 $ 457,141 1,412,292 $ 1,313,114
Cost of operations 391,601 427,804 1,254,481 1,214,734
General and administrative expenses 12,620 11,806 38,697 33,517
Income (loss) from construction operations 14,443 (3,895) 47,352 17,272
Capital expenditures 12 238 1,550 523
Depreciation and amortization 540 579 1,610 1,749
Building | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenue (19,269) (21,426) (71,762) (47,591)
Specialty Contractors        
Segment Reporting Information [Line Items]        
Revenue 226,462 101,206 580,682 429,202
Specialty Contractors | Unfavourable Adjustments Due to Mass Transit Project In California        
Segment Reporting Information [Line Items]        
Loss contingency, loss in period   17,700   17,700
Loss contingency, after tax   $ 13,000   $ 13,000
Loss contingency, after tax, diluted (in dollars per share)   $ 0.25   $ 0.25
Specialty Contractors | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 226,462 $ 101,206 580,682 $ 429,152
Cost of operations 205,270 143,078 553,383 467,645
General and administrative expenses 15,020 15,039 46,254 44,626
Income (loss) from construction operations 6,172 (56,911) (18,955) (83,069)
Capital expenditures 1,728 53 3,828 326
Depreciation and amortization 624 569 1,899 1,741
Specialty Contractors | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenue $ 0 $ 0 $ 0 $ 50