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Revenue
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregation of Revenue
The following tables disaggregate revenue by end market, customer type and contract type, which the Company believes best depicts how the nature, amount, timing and uncertainty of its revenue and cash flows are affected by economic factors for the three and nine months ended September 30, 2021 and 2020.
Three Months Ended
September 30,		Nine Months Ended
September 30,
(in thousands)2021202020212020
Civil segment revenue by end market:
Mass transit (includes certain transportation and tunneling projects)$386,913 $372,131 $1,062,322 $1,024,083 
Bridges67,117 104,722 179,059 246,006 
Military defense facilities46,615 44,246 140,736 102,898 
Water22,470 23,277 74,080 76,569 
Highways7,101 30,086 48,153 98,259 
Other16,002 37,534 72,795 119,786 
Total Civil segment revenue$546,218 $611,996 $1,577,145 $1,667,601 
Three Months Ended
September 30,		Nine Months Ended
September 30,
(in thousands)2021202020212020
Building segment revenue by end market:
Commercial and industrial facilities$75,402 $162,364 $307,414 $402,312 
Hospitality and gaming89,317 119,588 276,029 346,517 
Municipal and government76,471 66,505 222,855 215,230 
Education facilities39,528 50,425 123,988 129,085 
Mass transit (includes transportation projects)38,868 50,206 99,747 174,605 
Health care facilities20,287 26,344 44,294 94,651 
Other21,068 32,708 76,507 100,525 
Total Building segment revenue$360,941 $508,140 $1,150,834 $1,462,925 
Three Months Ended
September 30,		Nine Months Ended
September 30,
(in thousands)2021202020212020
Specialty Contractors segment revenue by end market:
Mass transit (includes certain transportation and tunneling projects)$135,971 $179,875 $465,179 $447,180 
Commercial and industrial facilities33,897 41,378 109,283 115,382 
Multi-unit residential28,054 39,014 101,498 103,118 
Water29,161 20,413 67,829 46,341 
Education facilities13,876 12,236 45,657 39,131 
Other30,104 29,039 87,635 87,569 
Total Specialty Contractors segment revenue$271,063 $321,955 $877,081 $838,721 
Three Months Ended
September 30, 2021		Three Months Ended
September 30, 2020
(in thousands)CivilBuildingSpecialty
Contractors		TotalCivilBuildingSpecialty
Contractors		Total
Revenue by customer type:
State and local agencies$478,720 $99,540 $110,012 $688,272 $526,771 $126,448 $155,175 $808,394 
Federal agencies48,680 50,437 14,716 113,833 48,861 32,392 29,362 110,615 
Private owners18,818 210,964 146,335 376,117 36,364 349,300 137,418 523,082 
Total revenue$546,218 $360,941 $271,063 $1,178,222 $611,996 $508,140 $321,955 $1,442,091 
Nine Months Ended
September 30, 2021		Nine Months Ended
September 30, 2020
(in thousands)CivilBuildingSpecialty
Contractors		TotalCivilBuildingSpecialty
Contractors		Total
Revenue by customer type:
State and local agencies$1,350,555 $268,396 $377,016 $1,995,967 $1,426,644 $430,212 $401,671 $2,258,527 
Federal agencies149,648 150,085 41,657 341,390 128,112 99,013 50,410 277,535 
Private owners76,942 732,353 458,408 1,267,703 112,845 933,700 386,640 1,433,185 
Total revenue$1,577,145 $1,150,834 $877,081 $3,605,060 $1,667,601 $1,462,925 $838,721 $3,969,247 
Three Months Ended
September 30, 2021		Three Months Ended
September 30, 2020
(in thousands)CivilBuildingSpecialty
Contractors		TotalCivilBuildingSpecialty
Contractors		Total
Revenue by contract type:
Fixed price$473,212 $89,895 $235,534 $798,641 $484,851 $117,650 $284,534 $887,035 
Guaranteed maximum price502 219,395 5,420 225,317 179 308,299 1,923 310,401 
Unit price71,429 130 23,558 95,117 124,506 254 31,191 155,951 
Cost plus fee and other1,075 51,521 6,551 59,147 2,460 81,937 4,307 88,704 
Total revenue$546,218 $360,941 $271,063 $1,178,222 $611,996 $508,140 $321,955 $1,442,091 

Nine Months Ended
September 30, 2021		Nine Months Ended
September 30, 2020
(in thousands)CivilBuildingSpecialty
Contractors		TotalCivilBuildingSpecialty
Contractors		Total
Revenue by contract type:
Fixed price$1,353,436 $269,693 $775,292 $2,398,421 $1,349,750 $401,957 $743,241 $2,494,948 
Guaranteed maximum price2,270 737,251 9,113 748,634 768 794,810 3,850 799,428 
Unit price212,678 (1,323)80,558 291,913 307,654 1,417 70,784 379,855 
Cost plus fee and other8,761 145,213 12,118 166,092 9,429 264,741 20,846 295,016 
Total revenue$1,577,145 $1,150,834 $877,081 $3,605,060 $1,667,601 $1,462,925 $838,721 $3,969,247 

Changes in Contract Estimates that Impact Revenue
Changes to the total estimated contract revenue or cost for a given project, either due to unexpected events or revisions to management’s initial estimates, are recognized in the period in which they are determined. Revenue was negatively impacted during the three and nine month periods ended September 30, 2021 related to performance obligations satisfied (or partially satisfied) in prior periods by $2.1 million and $37.1 million, respectively. Likewise, revenue was negatively impacted during the three and nine month periods ended September 30, 2020 related to performance obligations satisfied (or partially satisfied) in prior periods by $30.4 million and $71.3 million, respectively.
Remaining Performance Obligations
Remaining performance obligations represent the transaction price of firm orders for which work has not been performed and exclude unexercised contract options. As of September 30, 2021, the aggregate amounts of the transaction prices allocated to the remaining performance obligations of the Company’s construction contracts were $4.4 billion, $1.8 billion and $1.4 billion for the Civil, Building and Specialty Contractors segments, respectively. As of September 30, 2020, the aggregate amounts of the transaction prices allocated to the remaining performance obligations of the Company’s construction contracts were $5.1 billion, $1.9 billion and $1.9 billion for the Civil, Building and Specialty Contractors segments, respectively. The Company typically recognizes revenue on Civil segment projects over a period of three to five years, whereas for projects in the Building and Specialty Contractors segments, the Company typically recognizes revenue over a period of one to three years.