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Revenue (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following tables disaggregate revenue by end market, customer type and contract type, which the Company believes best depict how the nature, amount, timing and uncertainty of its revenue and cash flows are affected by economic factors for the years ended December 31, 2021, 2020 and 2019.
Year Ended December 31,
(in thousands)202120202019
Civil segment revenue by end market:
Mass transit (includes certain transportation and tunneling projects)$1,417,196 $1,367,412 $992,755 
Bridges238,345 306,161 334,117 
Military defense facilities194,701 146,969 59,082 
Water98,739 101,705 33,370 
Highways55,666 122,254 86,747 
Other91,113 155,398 273,281 
Total Civil segment revenue$2,095,760 $2,199,899 $1,779,352 
Year Ended December 31,
(in thousands)202120202019
Building segment revenue by end market:
Commercial and industrial facilities$352,265 $580,297 $459,806 
Hospitality and gaming338,998 474,329 297,700 
Municipal and government291,629 287,337 254,736 
Education facilities159,929 173,472 143,382 
Mass transit (includes transportation projects)130,923 218,930 201,400 
Health care facilities64,042 117,968 239,299 
Other90,316 132,308 145,717 
Total Building segment revenue$1,428,102 $1,984,641 $1,742,040 
Year Ended December 31,
(in thousands)202120202019
Specialty Contractors segment revenue by end market:
Mass transit (includes certain transportation and tunneling projects)$588,162 $592,430 $419,402 
Commercial and industrial facilities139,751 152,868 186,819 
Multi-unit residential133,085 139,924 83,903 
Water90,887 73,769 37,403 
Education facilities50,572 44,762 70,229 
Mixed use44,660 47,022 64,302 
Other70,851 83,448 67,382 
Total Specialty Contractors segment revenue$1,117,968 $1,134,223 $929,440 
Year Ended December 31, 2021
(in thousands)CivilBuildingSpecialty
Contractors		Total
Revenue by customer type:
State and local agencies$1,791,531 $363,686 $481,255 $2,636,472 
Federal agencies205,080 189,508 47,724 442,312 
Private owners99,149 874,908 588,989 1,563,046 
Total revenue$2,095,760 $1,428,102 $1,117,968 $4,641,830 
Year Ended December 31, 2020
(in thousands)CivilBuildingSpecialty
Contractors		Total
Revenue by customer type:
State and local agencies$1,875,653 $534,449 $533,768 $2,943,870 
Federal agencies175,933 143,327 75,067 394,327 
Private owners148,313 1,306,865 525,388 1,980,566 
Total revenue$2,199,899 $1,984,641 $1,134,223 $5,318,763 
Year Ended December 31, 2019
(in thousands)CivilBuildingSpecialty
Contractors		Total
Revenue by customer type:
State and local agencies$1,401,001 $573,049 $496,195 $2,470,245 
Federal agencies116,869 153,467 11,326 281,662 
Private owners261,482 1,015,524 421,919 1,698,925 
Total revenue$1,779,352 $1,742,040 $929,440 $4,450,832 
Year Ended December 31, 2021
(in thousands)CivilBuildingSpecialty
Contractors		Total
Revenue by contract type:
Fixed price$1,815,079 $336,128 $988,941 $3,140,148 
Guaranteed maximum price2,854 888,345 14,505 905,704 
Unit price268,377 (1,373)96,782 363,786 
Cost plus fee and other9,450 205,002 17,740 232,192 
Total revenue$2,095,760 $1,428,102 $1,117,968 $4,641,830 
Year Ended December 31, 2020
(in thousands)CivilBuildingSpecialty
Contractors		Total
Revenue by contract type:
Fixed price$1,792,765 $508,655 $1,010,973 $3,312,393 
Guaranteed maximum price1,829 1,136,782 15,417 1,154,028 
Unit price392,548 867 83,257 476,672 
Cost plus fee and other12,757 338,337 24,576 375,670 
Total revenue$2,199,899 $1,984,641 $1,134,223 $5,318,763 
Year Ended December 31, 2019
(in thousands)CivilBuildingSpecialty
Contractors		Total
Revenue by contract type:
Fixed price$1,315,195 $561,831 $769,410 $2,646,436 
Guaranteed maximum price6,951 752,110 21,291 780,352 
Unit price436,015 12,063 91,803 539,881 
Cost plus fee and other21,191 416,036 46,936 484,163 
Total revenue$1,779,352 $1,742,040 $929,440 $4,450,832