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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenues | The following tables provide further disaggregation of our revenues by categories we use to evaluate our financial performance within each of our reportable segments (in thousands):
| 2021 |  | % of Total |  | 2020 |  | % of Total |  | 2019 |  | % of Total
United States electrical construction and facilities services: |  |  |  |  |  |  |  |  |  |
Commercial market sector | $ | 1,059,908 |  |  | 52 | % |  | $ | 963,452 |  |  | 53 | % |  | $ | 1,078,200 |  |  | 55 | %
Manufacturing market sector | 226,644 |  |  | 11 | % |  | 241,415 |  |  | 13 | % |  | 224,913 |  |  | 11 | %
Healthcare market sector | 106,412 |  |  | 5 | % |  | 72,778 |  |  | 4 | % |  | 85,088 |  |  | 4 | %
Institutional market sector | 177,312 |  |  | 9 | % |  | 140,837 |  |  | 8 | % |  | 120,991 |  |  | 6 | %
Transportation market sector | 196,313 |  |  | 10 | % |  | 192,656 |  |  | 11 | % |  | 209,830 |  |  | 11 | %
Water and wastewater market sector | 14,962 |  |  | 1 | % |  | 6,882 |  |  | 1 | % |  | 19,888 |  |  | 1 | %
Hospitality market sector | 15,342 |  |  | 1 | % |  | 23,797 |  |  | 1 | % |  | 16,985 |  |  | 1 | %
Short duration projects (1) | 182,614 |  |  | 9 | % |  | 142,542 |  |  | 8 | % |  | 170,631 |  |  | 9 | %
Service work | 39,199 |  |  | 2 | % |  | 26,858 |  |  | 1 | % |  | 38,500 |  |  | 2 | %
| 2,018,706 |  |  |  |  | 1,811,217 |  |  |  |  | 1,965,026 |  |  |
Less intersegment revenues | (3,240) |  |  |  |  | (5,125) |  |  |  |  | (3,228) |  |  |
Total segment revenues | $ | 2,015,466 |  |  |  |  | $ | 1,806,092 |  |  |  |  | $ | 1,961,798 |  |  |
| 2021 |  | % of Total |  | 2020 |  | % of Total |  | 2019 |  | % of Total
United States mechanical construction and facilities services: |  |  |  |  |  |  |  |  |  |
Commercial market sector | $ | 1,525,816 |  |  | 39 | % |  | $ | 1,316,013 |  |  | 38 | % |  | $ | 1,185,129 |  |  | 36 | %
Manufacturing market sector | 523,896 |  |  | 13 | % |  | 430,365 |  |  | 12 | % |  | 533,699 |  |  | 16 | %
Healthcare market sector | 489,028 |  |  | 12 | % |  | 349,235 |  |  | 10 | % |  | 304,622 |  |  | 9 | %
Institutional market sector | 280,463 |  |  | 7 | % |  | 377,780 |  |  | 11 | % |  | 313,409 |  |  | 9 | %
Transportation market sector | 84,503 |  |  | 2 | % |  | 70,692 |  |  | 2 | % |  | 32,686 |  |  | 1 | %
Water and wastewater market sector | 213,315 |  |  | 6 | % |  | 185,996 |  |  | 5 | % |  | 202,428 |  |  | 6 | %
Hospitality market sector | 38,405 |  |  | 1 | % |  | 40,079 |  |  | 1 | % |  | 35,385 |  |  | 1 | %
Short duration projects (1) | 308,467 |  |  | 8 | % |  | 343,799 |  |  | 10 | % |  | 365,721 |  |  | 11 | %
Service work | 466,860 |  |  | 12 | % |  | 378,054 |  |  | 11 | % |  | 378,839 |  |  | 11 | %
| 3,930,753 |  |  |  |  | 3,492,013 |  |  |  |  | 3,351,918 |  |  |
Less intersegment revenues | (7,889) |  |  |  |  | (6,518) |  |  |  |  | (11,581) |  |  |
Total segment revenues | $ | 3,922,864 |  |  |  |  | $ | 3,485,495 |  |  |  |  | $ | 3,340,337 |  |  |
_________________ (1)Represents those projects which generally are completed within three months or less.
| 2021 |  | % of Total |  | 2020 |  | % of Total |  | 2019 |  | % of Total
United States building services: |  |  |  |  |  |  |  |  |  |  |
Mobile mechanical services | $ | 1,501,919 |  |  | 61 | % |  | $ | 1,282,803 |  |  | 60 | % |  | $ | 1,253,209 |  |  | 59 | %
Commercial site-based services | 680,351 |  |  | 28 | % |  | 587,345 |  |  | 28 | % |  | 571,345 |  |  | 27 | %
Government site-based services | 184,272 |  |  | 7 | % |  | 167,990 |  |  | 8 | % |  | 176,282 |  |  | 8 | %
Energy services | 102,350 |  |  | 4 | % |  | 95,878 |  |  | 4 | % |  | 120,825 |  |  | 6 | %
Total segment revenues | $ | 2,468,892 |  |  |  |  | $ | 2,134,016 |  |  |  |  | $ | 2,121,661 |  |  |
NOTE 3 - REVENUE FROM CONTRACTS WITH CUSTOMERS (Continued)
| 2021 |  | % of Total |  | 2020 |  | % of Total |  | 2019 |  | % of Total
United States industrial services: |  |  |  |  |  |  |  |  |  |  |
Field services | $ | 853,143 |  |  | 86 | % |  | $ | 813,872 |  |  | 86 | % |  | $ | 1,162,321 |  |  | 88 | %
Shop services | 133,264 |  |  | 14 | % |  | 127,023 |  |  | 14 | % |  | 165,235 |  |  | 12 | %
Total segment revenues | $ | 986,407 |  |  |  |  | $ | 940,895 |  |  |  |  | $ | 1,327,556 |  |  |
Total United States operations | $ | 9,393,629 |  |  |  |  | $ | 8,366,498 |  |  |  |  | $ | 8,751,352 |  |  |
| 2021 |  | % of Total |  | 2020 |  | % of Total |  | 2019 |  | % of Total
United Kingdom building services: |  |  |  |  |  |  |  |  |  |  |
Service work | $ | 261,889 |  |  | 51 | % |  | $ | 221,373 |  |  | 51 | % |  | $ | 212,876 |  |  | 50 | %
Project work | 248,062 |  |  | 49 | % |  | 209,190 |  |  | 49 | % |  | 210,383 |  |  | 50 | %
Total segment revenues | $ | 509,951 |  |  |  |  | $ | 430,563 |  |  |  |  | $ | 423,259 |  |  |
Total operations | $ | 9,903,580 |  |  |  |  | $ | 8,797,061 |  |  |  |  | $ | 9,174,611 |  |  |
Contract Assets and Contract Liabilities | Net contract liabilities in the accompanying Consolidated Balance Sheets consisted of the following amounts as of December 31, 2021 and 2020 (in thousands):
| December 31, 2021 |  | December 31, 2020
Contract assets, current | $ | 230,143 |  |  | $ | 171,956 |
Contract assets, non-current | — |  |  | — |
Contract liabilities, current | (788,134) |  |  | (722,252) |
Contract liabilities, non-current | (2,505) |  |  | (2,283) |
Net contract liabilities | $ | (560,496) |  |  | $ | (552,579) |
Net Contract Liabilities on Uncompleted Construction Projects | Included within net contract liabilities were $500.3 million and $496.8 million of net contract liabilities on uncompleted construction projects as of December 31, 2021 and 2020, respectively, as follows (in thousands):
| December 31, 2021 |  | December 31, 2020
Costs incurred on uncompleted construction contracts | $ | 11,034,038 |  |  | $ | 10,727,358 |
Estimated earnings, thereon | 1,731,479 |  |  | 1,640,250 |
| 12,765,517 |  |  | 12,367,608 |
Less: billings to date | 13,265,865 |  |  | 12,864,404 |
| $ | (500,348) |  |  | $ | (496,796) |
Remaining Performance Obligations | The following table presents the transaction price allocated to remaining unsatisfied performance obligations (“remaining performance obligations”) for each of our reportable segments and their respective percentages of total remaining performance obligations (in thousands, except for percentages):
| December 31, 2021 |  | % of Total
Remaining performance obligations: |  |  |
United States electrical construction and facilities services | $ | 1,210,568 |  |  | 22 | %
United States mechanical construction and facilities services | 3,320,359 |  |  | 59 | %
United States building services | 838,324 |  |  | 15 | %
United States industrial services | 111,838 |  |  | 2 | %
Total United States operations | 5,481,089 |  |  | 98 | %
United Kingdom building services | 118,208 |  |  | 2 | %
Total operations | $ | 5,599,297 |  |  | 100 | %
Remaining Performance Obligations, Expected Timing of Satisfaction | Refer to the table below for additional information regarding our remaining performance obligations, including an estimate of when we expect to recognize such remaining performance obligations as revenue (in thousands):
| Within one year |  | Greater than one year
Remaining performance obligations: |  |  |
United States electrical construction and facilities services | $ | 1,073,432 |  |  | $ | 137,136 |
United States mechanical construction and facilities services | 2,640,609 |  |  | 679,750 |
United States building services | 751,602 |  |  | 86,722 |
United States industrial services | 111,838 |  |  | — |
Total United States operations | 4,577,481 |  |  | 903,608 |
United Kingdom building services | 92,371 |  |  | 25,837 |
Total operations | $ | 4,669,852 |  |  | $ | 929,445 |

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