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Disaggregation of revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Operating revenues $ 1,385,160 $ 1,587,289 $ 1,362,928 $ 1,197,373 $ 1,378,213 $ 1,563,799 $ 1,303,573 $ 1,091,191 $ 5,532,750 $ 5,336,776 $ 4,531,552
Intersegment eliminations                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 (76,969) (77,149) (64,307)
Intrasegment eliminations                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 (550,815) (525,749) (465,969)
Natural gas transportation                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 157,232 147,114 132,397
Natural gas gathering                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 4,865 9,164 9,159
Natural gas storage                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 14,918 11,708 11,543
Contracting services                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 1,069,665 1,088,633 968,755
Construction materials                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 1,659,152 1,627,833 1,423,068
Inside specialty contracting                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 1,397,124 1,266,196 926,875
Outside specialty contracting                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 649,486 531,882 392,544
Other                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 68,865 82,669 76,796
Revenues from contracts with customers                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 5,471,545 5,281,621 4,469,761
Revenues out of scope                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 61,205 55,155 61,791
Residential utility sales                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 599,051 608,821 579,436
Commercial utility sales                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 409,350 438,431 412,952
Industrial utility sales                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 62,987 64,660 58,956
Other utility sales                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 6,634 7,408 7,556
Electric                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 331,538 351,725 335,123
Electric | Intersegment eliminations                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 (491) 0 0
Electric | Other                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 32,452 35,574 31,568
Electric | Revenues from contracts with customers                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 329,479 347,712 331,190
Electric | Revenues out of scope                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 2,059 4,013 3,933
Electric | Residential utility sales                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 122,663 125,369 121,477
Electric | Commercial utility sales                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 131,477 141,596 136,236
Electric | Industrial utility sales                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 36,744 37,765 34,353
Electric | Other utility sales                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 6,634 7,408 7,556
Natural gas distribution                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 847,651 865,222 823,247
Natural gas distribution | Intersegment eliminations                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 (534) 0 0
Natural gas distribution | Natural gas transportation                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 45,546 45,449 43,238
Natural gas distribution | Other                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 10,753 12,726 14,579
Natural gas distribution | Revenues from contracts with customers                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 836,269 865,357 817,095
Natural gas distribution | Revenues out of scope                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 11,382 (135) 6,152
Natural gas distribution | Residential utility sales                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 476,388 483,452 457,959
Natural gas distribution | Commercial utility sales                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 277,873 296,835 276,716
Natural gas distribution | Industrial utility sales                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 26,243 26,895 24,603
Natural gas distribution | Other utility sales                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 0 0 0
Pipeline                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 85,346 84,192 78,018
Pipeline | Intersegment eliminations                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 (58,531) (56,252) (50,905)
Pipeline | Natural gas transportation                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 111,686 101,665 89,159
Pipeline | Natural gas gathering                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 4,865 9,164 9,159
Pipeline | Natural gas storage                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 14,918 11,708 11,543
Pipeline | Other                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 12,216 17,687 18,865
Pipeline | Revenues from contracts with customers                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 85,154 83,972 77,821
Pipeline | Revenues out of scope                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 192 220 197
Construction materials and contracting                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 2,177,585 2,189,651 1,925,185
Construction materials and contracting | Intersegment eliminations                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 (417) (1,066) (669)
Construction materials and contracting | Intrasegment eliminations                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 (550,815) (525,749) (465,969)
Construction materials and contracting | Contracting services                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 1,069,665 1,088,633 968,755
Construction materials and contracting | Construction materials                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 1,659,152 1,627,833 1,423,068
Construction materials and contracting | Other                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 0 0 0
Construction materials and contracting | Revenues from contracts with customers                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 2,177,585 2,189,651 1,925,185
Construction materials and contracting | Revenues out of scope                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 0 0 0
Construction services                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 2,090,685 1,845,896 1,369,772
Construction services | Intersegment eliminations                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 (5,038) (3,370) (1,681)
Construction services | Inside specialty contracting                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 1,397,124 1,266,196 926,875
Construction services | Outside specialty contracting                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 649,486 531,882 392,544
Construction services | Other                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 1,541 131 525
Construction services | Revenues from contracts with customers                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 2,043,113 1,794,839 1,318,263
Construction services | Revenues out of scope                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 47,572 51,057 51,509
Other                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 (55) 90 207
Other | Intersegment eliminations                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 (11,958) (16,461) (11,052)
Other | Other                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 11,903 16,551 11,259
Other | Revenues from contracts with customers                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 (55) 90 207
Other | Revenues out of scope                      
Disaggregation of Revenue [Line Items]                      
Operating revenues                 $ 0 $ 0 $ 0