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Disaggregation of revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 6,973,864 | $ 5,680,733 | $ 5,532,750
Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (84,176) | (77,606) | (76,969)
Internal sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (593,882) | (501,044) | (550,815)
Natural gas transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 178,176 | 162,409 | 157,232
Natural Gas Gathering [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 4,865
Natural gas storage |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 14,583 | 14,680 | 14,918
Contracting services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,187,721 | 1,017,471 | 1,069,665
Construction materials |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,940,890 | 1,712,503 | 1,659,152
Electrical & mechanical specialty contracting |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,988,729 | 1,324,419 | 1,397,124
Transmission & distribution specialty contracting |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 662,705 | 677,074 | 649,486
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 88,716 | 81,407 | 68,865
Revenues from contracts with customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 6,933,344 | 5,628,488 | 5,471,545
Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 40,520 | 52,245 | 61,205
Residential utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 856,825 | 671,562 | 599,051
Commercial utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 599,984 | 465,841 | 409,350
Industrial utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 85,476 | 72,721 | 62,987
Other utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7,597 | 7,051 | 6,634
Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 376,579 | 349,039 | 331,538
Electric | Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (494) | (543) | (491)
Electric | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 45,608 | 42,902 | 32,452
Electric | Revenues from contracts with customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 381,293 | 355,564 | 329,479
Electric | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (4,714) | (6,525) | 2,059
Electric | Residential utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 138,634 | 126,841 | 122,663
Electric | Commercial utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 146,182 | 137,556 | 131,477
Electric | Industrial utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 43,766 | 41,757 | 36,744
Electric | Other utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7,597 | 7,051 | 6,634
Natural gas distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,273,249 | 971,364 | 847,651
Natural gas distribution | Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (555) | (576) | (534)
Natural gas distribution | Natural gas transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 48,886 | 48,408 | 45,546
Natural gas distribution | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 13,617 | 10,567 | 10,753
Natural gas distribution | Revenues from contracts with customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,275,651 | 962,369 | 836,269
Natural gas distribution | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (2,402) | 8,995 | 11,382
Natural gas distribution | Residential utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 718,191 | 544,721 | 476,388
Natural gas distribution | Commercial utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 453,802 | 328,285 | 277,873
Natural gas distribution | Industrial utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 41,710 | 30,964 | 26,243
Natural gas distribution | Other utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Pipeline |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 96,567 | 82,858 | 85,346
Pipeline | Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (59,012) | (59,678) | (58,531)
Pipeline | Natural gas transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 129,290 | 114,001 | 111,686
Pipeline | Natural Gas Gathering [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 4,865
Pipeline | Natural gas storage |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 14,583 | 14,680 | 14,918
Pipeline | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 11,450 | 13,667 | 12,216
Pipeline | Revenues from contracts with customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 96,311 | 82,670 | 85,154
Pipeline | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 256 | 188 | 192
Construction materials and contracting |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,533,713 | 2,228,306 | 2,177,585
Construction materials and contracting | Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (1,016) | (624) | (417)
Construction materials and contracting | Internal sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (593,882) | (501,044) | (550,815)
Construction materials and contracting | Contracting services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,187,721 | 1,017,471 | 1,069,665
Construction materials and contracting | Construction materials |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,940,890 | 1,712,503 | 1,659,152
Construction materials and contracting | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Construction materials and contracting | Revenues from contracts with customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,533,713 | 2,228,306 | 2,177,585
Construction materials and contracting | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Construction services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,693,756 | 2,049,082 | 2,090,685
Construction services | Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (5,494) | (2,555) | (5,038)
Construction services | Electrical & mechanical specialty contracting |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,988,729 | 1,324,419 | 1,397,124
Construction services | Transmission & distribution specialty contracting |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 662,705 | 677,074 | 649,486
Construction services | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 436 | 557 | 1,541
Construction services | Revenues from contracts with customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,646,376 | 1,999,495 | 2,043,113
Construction services | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 47,380 | 49,587 | 47,572
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 84 | (55)
Other | Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (17,605) | (13,630) | (11,958)
Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 17,605 | 13,714 | 11,903
Other | Revenues from contracts with customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 84 | (55)
Other | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 0 | $ 0 | $ 0

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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