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Disaggregation of revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]    
Operating revenues: $ 1,737,337 $ 1,416,559
Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (31,767) (31,730)
Intrasegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (39,585) (46,033)
Natural gas transportation    
Disaggregation of Revenue [Line Items]    
Operating revenues: 48,487 43,955
Natural gas storage    
Disaggregation of Revenue [Line Items]    
Operating revenues: 3,861 3,719
Contracting services    
Disaggregation of Revenue [Line Items]    
Operating revenues: 114,983 114,267
Construction materials    
Disaggregation of Revenue [Line Items]    
Operating revenues: 232,502 241,732
Electrical & mechanical specialty contracting    
Disaggregation of Revenue [Line Items]    
Operating revenues: 590,263 392,808
Transmission & distribution specialty contracting    
Disaggregation of Revenue [Line Items]    
Operating revenues: 152,022 148,466
Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 23,230 21,460
Revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Operating revenues: 1,730,121 1,409,053
Revenues out of scope    
Disaggregation of Revenue [Line Items]    
Operating revenues: 7,216 7,506
Residential utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 365,476 296,120
Commercial utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 241,274 199,209
Industrial utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 27,601 23,330
Other utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 1,774 1,750
Electric    
Disaggregation of Revenue [Line Items]    
Operating revenues: 95,602 93,594
Electric | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (122) (124)
Electric | Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 11,878 12,753
Electric | Revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Operating revenues: 98,465 97,589
Electric | Revenues out of scope    
Disaggregation of Revenue [Line Items]    
Operating revenues: (2,863) (3,995)
Electric | Residential utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 37,825 37,304
Electric | Commercial utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 36,347 35,600
Electric | Industrial utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 10,763 10,306
Electric | Other utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 1,774 1,750
Natural gas distribution    
Disaggregation of Revenue [Line Items]    
Operating revenues: 565,517 450,418
Natural gas distribution | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (150) (136)
Natural gas distribution | Natural gas transportation    
Disaggregation of Revenue [Line Items]    
Operating revenues: 13,504 12,381
Natural gas distribution | Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 4,721 2,609
Natural gas distribution | Revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Operating revenues: 567,491 450,303
Natural gas distribution | Revenues out of scope    
Disaggregation of Revenue [Line Items]    
Operating revenues: (1,974) 115
Natural gas distribution | Residential utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 327,651 258,816
Natural gas distribution | Commercial utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 204,927 163,609
Natural gas distribution | Industrial utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 16,838 13,024
Natural gas distribution | Other utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 0 0
Pipeline    
Disaggregation of Revenue [Line Items]    
Operating revenues: 14,331 11,120
Pipeline | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (26,410) (25,940)
Pipeline | Natural gas transportation    
Disaggregation of Revenue [Line Items]    
Operating revenues: 34,983 31,574
Pipeline | Natural gas storage    
Disaggregation of Revenue [Line Items]    
Operating revenues: 3,861 3,719
Pipeline | Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 1,859 1,709
Pipeline | Revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Operating revenues: 14,293 11,062
Pipeline | Revenues out of scope    
Disaggregation of Revenue [Line Items]    
Operating revenues: 38 58
Construction materials and contracting    
Disaggregation of Revenue [Line Items]    
Operating revenues: 307,768 309,836
Construction materials and contracting | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (132) (130)
Construction materials and contracting | Intrasegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (39,585) (46,033)
Construction materials and contracting | Contracting services    
Disaggregation of Revenue [Line Items]    
Operating revenues: 114,983 114,267
Construction materials and contracting | Construction materials    
Disaggregation of Revenue [Line Items]    
Operating revenues: 232,502 241,732
Construction materials and contracting | Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 0 0
Construction materials and contracting | Revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Operating revenues: 307,768 309,836
Construction materials and contracting | Revenues out of scope    
Disaggregation of Revenue [Line Items]    
Operating revenues: 0 0
Construction services    
Disaggregation of Revenue [Line Items]    
Operating revenues: 754,119 551,591
Construction services | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (214) (1,059)
Construction services | Electrical & mechanical specialty contracting    
Disaggregation of Revenue [Line Items]    
Operating revenues: 590,263 392,808
Construction services | Transmission & distribution specialty contracting    
Disaggregation of Revenue [Line Items]    
Operating revenues: 152,022 148,466
Construction services | Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 33 48
Construction services | Revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Operating revenues: 742,104 540,263
Construction services | Revenues out of scope    
Disaggregation of Revenue [Line Items]    
Operating revenues: 12,015 11,328
Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 0 0
Other | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (4,739) (4,341)
Other | Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 4,739 4,341
Other | Revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Operating revenues: 0 0
Other | Revenues out of scope    
Disaggregation of Revenue [Line Items]    
Operating revenues: $ 0 $ 0