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Disaggregation of revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Operating revenues: $ 1,227,938 $ 1,197,373
Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (30,935) (31,085)
Intrasegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (46,716) (44,104)
Natural gas transportation    
Disaggregation of Revenue [Line Items]    
Operating revenues: 41,869 39,230
Natural gas gathering    
Disaggregation of Revenue [Line Items]    
Operating revenues:   2,090
Natural gas storage    
Disaggregation of Revenue [Line Items]    
Operating revenues: 4,029 3,046
Contracting services    
Disaggregation of Revenue [Line Items]    
Operating revenues: 96,025 98,401
Construction materials    
Disaggregation of Revenue [Line Items]    
Operating revenues: 216,412 207,910
Inside specialty contracting    
Disaggregation of Revenue [Line Items]    
Operating revenues: 355,190 372,209
Outside specialty contracting    
Disaggregation of Revenue [Line Items]    
Operating revenues: 151,363 130,150
Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 18,819 17,531
Revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Operating revenues: 1,216,016 1,183,547
Revenues out of scope    
Disaggregation of Revenue [Line Items]    
Operating revenues: 11,922 13,826
Residential utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 236,573 219,050
Commercial utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 152,980 148,583
Industrial utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 18,841 18,888
Other utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 1,566 1,648
Electric    
Disaggregation of Revenue [Line Items]    
Operating revenues: 84,673 85,908
Electric | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (136) (195)
Electric | Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 9,773 8,450
Electric | Revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Operating revenues: 87,596 86,206
Electric | Revenues out of scope    
Disaggregation of Revenue [Line Items]    
Operating revenues: (2,923) (298)
Electric | Residential utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 33,436 32,349
Electric | Commercial utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 32,928 33,587
Electric | Industrial utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 10,029 10,367
Electric | Other utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 1,566 1,648
Natural gas distribution    
Disaggregation of Revenue [Line Items]    
Operating revenues: 350,206 326,443
Natural gas distribution | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (142) (185)
Natural gas distribution | Natural gas transportation    
Disaggregation of Revenue [Line Items]    
Operating revenues: 12,452 11,798
Natural gas distribution | Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 3,009 2,498
Natural gas distribution | Revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Operating revenues: 347,320 324,329
Natural gas distribution | Revenues out of scope    
Disaggregation of Revenue [Line Items]    
Operating revenues: 2,886 2,114
Natural gas distribution | Residential utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 203,137 186,701
Natural gas distribution | Commercial utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 120,052 114,996
Natural gas distribution | Industrial utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 8,812 8,521
Natural gas distribution | Other utility sales    
Disaggregation of Revenue [Line Items]    
Operating revenues: 0 0
Pipeline    
Disaggregation of Revenue [Line Items]    
Operating revenues: 9,913 10,655
Pipeline | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (26,229) (25,199)
Pipeline | Natural gas transportation    
Disaggregation of Revenue [Line Items]    
Operating revenues: 29,417 27,432
Pipeline | Natural gas gathering    
Disaggregation of Revenue [Line Items]    
Operating revenues:   2,090
Pipeline | Natural gas storage    
Disaggregation of Revenue [Line Items]    
Operating revenues: 4,029 3,046
Pipeline | Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 2,660 3,241
Pipeline | Revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Operating revenues: 9,877 10,610
Pipeline | Revenues out of scope    
Disaggregation of Revenue [Line Items]    
Operating revenues: 36 45
Construction materials and contracting    
Disaggregation of Revenue [Line Items]    
Operating revenues: 265,659 262,144
Construction materials and contracting | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (62) (63)
Construction materials and contracting | Intrasegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (46,716) (44,104)
Construction materials and contracting | Contracting services    
Disaggregation of Revenue [Line Items]    
Operating revenues: 96,025 98,401
Construction materials and contracting | Construction materials    
Disaggregation of Revenue [Line Items]    
Operating revenues: 216,412 207,910
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: 265,659 262,144
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: 517,470 512,205
Construction services | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (1,042) (2,470)
Construction services | Inside specialty contracting    
Disaggregation of Revenue [Line Items]    
Operating revenues: 355,190 372,209
Construction services | Outside specialty contracting    
Disaggregation of Revenue [Line Items]    
Operating revenues: 151,363 130,150
Construction services | Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 36 351
Construction services | Revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Operating revenues: 505,547 500,240
Construction services | Revenues out of scope    
Disaggregation of Revenue [Line Items]    
Operating revenues: 11,923 11,965
Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 17 18
Other | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Operating revenues: (3,324) (2,973)
Other | Other    
Disaggregation of Revenue [Line Items]    
Operating revenues: 3,341 2,991
Other | Revenues from contracts with customers    
Disaggregation of Revenue [Line Items]    
Operating revenues: 17 18
Other | Revenues out of scope    
Disaggregation of Revenue [Line Items]    
Operating revenues: $ 0 $ 0