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Business Segments (Reportable Segments) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Revenue $ 1,060,705 $ 1,070,926 $ 2,858,756 $ 2,884,107
Income (loss) from construction operations (12,566) (6,892) (92,123) (107,353)
Capital expenditures 14,967 13,964 45,590 42,809
Depreciation and amortization 11,231 15,533 31,985 54,054
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 1,086,953 1,157,793 $ 2,905,025 3,111,612
Income (loss) from construction operations 8,583 11,006 (34,318) (60,956)
Capital expenditures 12,573 13,541 41,456 41,878
Depreciation and amortization 9,056 13,165 25,264 46,991
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenue (26,248) (86,867) (46,269) (227,505)
Corporate        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Income (loss) from construction operations (21,149) (17,898) (57,805) (46,397)
Capital expenditures 2,394 423 4,134 931
Depreciation and amortization 2,175 2,368 6,721 7,063
Civil        
Segment Reporting Information [Line Items]        
Revenue 520,494 500,905 1,424,487 1,295,322
Civil | Unfavorable Adjustment Legal Ruling Pertaining To Mass-Transit Project In California        
Segment Reporting Information [Line Items]        
Loss contingency 23,200      
Loss contingency, after tax $ 16,800      
Loss contingency, after tax, diluted (in dollars per share) $ 0.32      
Civil | Favorable Adjustment Legal Ruling Pertaining To Mass-Transit Project In California        
Segment Reporting Information [Line Items]        
Favorable arbitration $ 8,800   8,800  
Favorable arbitration, after tax $ 7,000   $ 7,000  
Favorable arbitration, after tax, diluted (in dollars per share) $ 0.13   $ 0.14  
Civil | Unfavorable Legal Ruling Pertaining To Highway Project In North East        
Segment Reporting Information [Line Items]        
Loss contingency   14,300   14,300
Loss contingency, after tax   $ 10,200   $ 10,200
Loss contingency, after tax, diluted (in dollars per share)   $ 0.20   $ 0.20
Civil | Unfavorable Legal Ruling Pertaining to Mass-Transit Project in California        
Segment Reporting Information [Line Items]        
Loss contingency     $ 23,200 $ 34,600
Loss contingency, after tax     $ 16,800 $ 27,300
Loss contingency, after tax, diluted (in dollars per share)     $ 0.32 $ 0.53
Favorable arbitration     $ 25,600 $ 13,100
Favorable arbitration, after tax     $ 20,300 $ 9,400
Favorable arbitration, after tax, diluted (in dollars per share)     $ 0.39 $ 0.18
Civil | Adverse Legal Ruling Pertaining to Bridge Project in New York        
Segment Reporting Information [Line Items]        
Loss contingency       $ 25,500
Loss contingency, after tax       $ 18,300
Loss contingency, after tax, diluted (in dollars per share)       $ 0.36
Civil | Unfavorable Settlement due to Project in Maryland        
Segment Reporting Information [Line Items]        
Loss contingency       $ 16,200
Loss contingency, after tax       $ 11,600
Loss contingency, after tax, diluted (in dollars per share)       $ 0.23
Civil | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue $ 543,776 $ 564,205 $ 1,477,553 $ 1,478,162
Income (loss) from construction operations 46,889 22,786 170,308 12,052
Capital expenditures 11,941 11,872 36,649 38,703
Depreciation and amortization 7,698 12,166 21,753 44,191
Civil | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenue (23,282) (63,300) (53,066) (182,840)
Building        
Segment Reporting Information [Line Items]        
Revenue 365,449 318,050 926,444 915,639
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 368,244 341,614 919,468 960,148
Income (loss) from construction operations 123 56 (83,917) 9,453
Capital expenditures 241 921 3,716 973
Depreciation and amortization 743 470 1,655 1,261
Building | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenue (2,795) (23,564) 6,976 (44,509)
Specialty Contractors        
Segment Reporting Information [Line Items]        
Revenue 174,762 251,971 507,825 673,146
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 Adjustment Legal Ruling Pertaining To Mass-Transit Project In California        
Segment Reporting Information [Line Items]        
Loss contingency $ 9,400   $ 9,400  
Loss contingency, after tax $ 6,800   $ 6,800  
Loss contingency, after tax, diluted (in dollars per share) $ 0.13   $ 0.13  
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 | Unfavorable Adjustment due to Electrical Project in the Northeast        
Segment Reporting Information [Line Items]        
Loss contingency       36,000
Loss contingency, after tax       $ 26,000
Loss contingency, after tax, diluted (in dollars per share)       $ 0.51
Specialty Contractors | Legal Appeal due to Electrical Project in New York        
Segment Reporting Information [Line Items]        
Loss contingency       $ 17,800
Loss contingency, after tax       $ 12,800
Loss contingency, after tax, diluted (in dollars per share)       $ 0.25
Specialty Contractors | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue $ 174,933 251,974 $ 508,004 $ 673,302
Income (loss) from construction operations (38,429) (11,836) (120,709) (82,461)
Capital expenditures 391 748 1,091 2,202
Depreciation and amortization 615 529 1,856 1,539
Specialty Contractors | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenue (171) $ (3) (179) (156)
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 18,000
Loss contingency, after tax $ 10,900   $ 21,400 $ 13,900
Loss contingency, after tax, diluted (in dollars per share) $ 0.21   $ 0.41 $ 0.27