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Revenue from contracts with customers - Disaggregation of revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 1,035,762 $ 1,079,031 $ 2,240,111 $ 2,501,913
Other revenues 11,783 12,095 21,259 19,311
Total external operating revenues 1,047,545 1,091,126 2,261,370 2,521,224
Intersegment eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (10,833) (11,165) (42,732) (39,105)
Total external operating revenues (10,833) (11,165) (42,732) (39,105)
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total external operating revenues 1,056,960 1,099,140 2,301,252 2,555,606
Natural gas transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 56,730 46,065 114,958 94,553
Natural gas storage        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 5,331 3,758 10,713 7,620
Electrical & mechanical specialty contracting        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 502,015 568,307 941,393 1,158,570
Transmission & distribution specialty contracting        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 190,881 167,485 367,741 319,507
Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 24,526 22,068 47,092 42,132
Residential utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 138,127 151,792 440,452 517,267
Commercial utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 105,894 109,458 309,539 350,731
Industrial utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 21,026 19,553 46,954 47,154
Other utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 2,065 1,710 4,001 3,484
Electric | Intersegment eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (64) (27) (93) (55)
Electric | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 100,002 92,671 209,625 191,231
Other revenues (845) (1,682) (2,742) (4,545)
Total external operating revenues 99,157 90,989 206,883 186,686
Electric | Natural gas transportation | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Electric | Natural gas storage | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Electric | Electrical & mechanical specialty contracting | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Electric | Transmission & distribution specialty contracting | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Electric | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 13,186 11,531 28,816 23,410
Electric | Residential utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 31,437 30,825 70,659 68,650
Electric | Commercial utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 41,620 38,262 83,135 74,609
Electric | Industrial utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,758 10,370 23,107 21,133
Electric | Other utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 2,065 1,710 4,001 3,484
Natural gas distribution | Intersegment eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (49) (69) (105) (139)
Natural gas distribution | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 199,274 216,220 656,823 783,789
Other revenues 2,157 2,775 4,078 801
Total external operating revenues 201,431 218,995 660,901 784,590
Natural gas distribution | Natural gas transportation | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 13,324 11,671 27,915 25,175
Natural gas distribution | Natural gas storage | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Natural gas distribution | Electrical & mechanical specialty contracting | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Natural gas distribution | Transmission & distribution specialty contracting | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Natural gas distribution | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 5,767 3,272 8,969 7,993
Natural gas distribution | Residential utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 106,690 120,967 369,793 448,617
Natural gas distribution | Commercial utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 64,274 71,196 226,404 276,122
Natural gas distribution | Industrial utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 9,268 9,183 23,847 26,021
Natural gas distribution | Other utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Pipeline | Intersegment eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (9,055) (7,918) (39,365) (34,188)
Pipeline | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 43,792 34,171 64,757 48,607
Other revenues 39 38 86 76
Total external operating revenues 43,831 34,209 64,843 48,683
Pipeline | Natural gas transportation | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 43,406 34,394 87,043 69,378
Pipeline | Natural gas storage | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 5,331 3,758 10,713 7,620
Pipeline | Electrical & mechanical specialty contracting | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Pipeline | Transmission & distribution specialty contracting | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Pipeline | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 4,110 3,937 6,366 5,797
Pipeline | Residential utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Pipeline | Commercial utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Pipeline | Industrial utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Pipeline | Other utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Construction services | Intersegment eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (249) 0 (336) 0
Construction services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 692,692 735,969 1,308,889 1,478,286
Other revenues 10,432 10,964 19,837 22,979
Total external operating revenues 703,124 746,933 1,328,726 1,501,265
Construction services | Natural gas transportation | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Construction services | Natural gas storage | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Construction services | Electrical & mechanical specialty contracting | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 502,015 568,307 941,393 1,158,570
Construction services | Transmission & distribution specialty contracting | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 190,881 167,485 367,741 319,507
Construction services | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 45 177 91 209
Construction services | Residential utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Construction services | Commercial utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Construction services | Industrial utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Construction services | Other utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Other | Intersegment eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (1,416) (3,151) (2,833) (4,723)
Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 2 0 17 0
Other revenues 0 0 0 0
Total external operating revenues 2 0 17 0
Other | Natural gas transportation | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Other | Natural gas storage | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Other | Electrical & mechanical specialty contracting | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Other | Transmission & distribution specialty contracting | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Other | Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 1,418 3,151 2,850 4,723
Other | Residential utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Other | Commercial utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Other | Industrial utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Other | Other utility sales | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 0 $ 0 $ 0 $ 0