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Goodwill rollforward (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Goodwill [Roll Forward]      
Balance at beginning of period $ 763,500 $ 765,386 $ 765,386
Goodwill acquired during the year 0 0 238
Measurement period adjustments 0 (2,124) (2,124)
Balance at end of period 763,500 763,262 763,500
Natural gas distribution      
Goodwill [Roll Forward]      
Balance at beginning of period 345,736 345,736 345,736
Goodwill acquired during the year 0 0 0
Measurement period adjustments 0 0 0
Balance at end of period 345,736 345,736 345,736
Construction materials and contracting      
Goodwill [Roll Forward]      
Balance at beginning of period 274,540 276,426 276,426
Goodwill acquired during the year 0 0 238
Measurement period adjustments 0 (2,124) (2,124)
Balance at end of period 274,540 274,302 274,540
Construction services      
Goodwill [Roll Forward]      
Balance at beginning of period 143,224 143,224 143,224
Goodwill acquired during the year 0 0 0
Measurement period adjustments 0 0 0
Balance at end of period $ 143,224 $ 143,224 $ 143,224