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Revenue (Schedule Of Revenue By Contract Type) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]        
Revenue $ 1,060,705 $ 1,070,926 $ 2,858,756 $ 2,884,107
Adverse Legal Ruling Pertaining to Mixed-Use Project in New York        
Disaggregation of Revenue [Line Items]        
Loss contingency     83,600  
Fixed price        
Disaggregation of Revenue [Line Items]        
Revenue 691,145 726,906 1,999,737 1,925,226
Guaranteed maximum price        
Disaggregation of Revenue [Line Items]        
Revenue 166,395 150,445 361,220 477,196
Unit price        
Disaggregation of Revenue [Line Items]        
Revenue 116,470 116,323 253,276 275,962
Cost plus fee and other        
Disaggregation of Revenue [Line Items]        
Revenue 86,695 77,252 244,523 205,723
Civil        
Disaggregation of Revenue [Line Items]        
Revenue 520,494 500,905 1,424,487 1,295,322
Civil | Fixed price        
Disaggregation of Revenue [Line Items]        
Revenue 417,973 416,216 1,217,689 1,090,623
Civil | Guaranteed maximum price        
Disaggregation of Revenue [Line Items]        
Revenue 91 (13) 46 581
Civil | Unit price        
Disaggregation of Revenue [Line Items]        
Revenue 91,906 90,372 183,580 213,092
Civil | Cost plus fee and other        
Disaggregation of Revenue [Line Items]        
Revenue 10,524 (5,670) 23,172 (8,974)
Building        
Disaggregation of Revenue [Line Items]        
Revenue 365,449 318,050 926,444 915,639
Building | Adverse Legal Ruling Pertaining to Mixed-Use Project in New York        
Disaggregation of Revenue [Line Items]        
Loss contingency     72,200  
Building | Fixed price        
Disaggregation of Revenue [Line Items]        
Revenue 130,422 103,804 362,591 270,618
Building | Guaranteed maximum price        
Disaggregation of Revenue [Line Items]        
Revenue 165,397 144,831 360,245 462,294
Building | Unit price        
Disaggregation of Revenue [Line Items]        
Revenue 0 0 0 33
Building | Cost plus fee and other        
Disaggregation of Revenue [Line Items]        
Revenue 69,630 69,415 203,608 182,694
Specialty Contractors        
Disaggregation of Revenue [Line Items]        
Revenue 174,762 251,971 507,825 673,146
Specialty Contractors | Adverse Legal Ruling Pertaining to Mixed-Use Project in New York        
Disaggregation of Revenue [Line Items]        
Loss contingency     11,400  
Specialty Contractors | Fixed price        
Disaggregation of Revenue [Line Items]        
Revenue 142,750 206,886 419,457 563,985
Specialty Contractors | Guaranteed maximum price        
Disaggregation of Revenue [Line Items]        
Revenue 907 5,627 929 14,321
Specialty Contractors | Unit price        
Disaggregation of Revenue [Line Items]        
Revenue 24,564 25,951 69,696 62,837
Specialty Contractors | Cost plus fee and other        
Disaggregation of Revenue [Line Items]        
Revenue $ 6,541 $ 13,507 $ 17,743 $ 32,003