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Goodwill and Intangible Assets - Goodwill (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
Goodwill  
Goodwill, Beginning Balance $ 581,664
Goodwill acquired during the period 1,870
Goodwill, Ending Balance 583,534
Utilities  
Goodwill  
Goodwill, Beginning Balance 462,905
Goodwill, Ending Balance 462,905
Energy/Renewables  
Goodwill  
Goodwill, Beginning Balance 66,344
Goodwill acquired during the period 1,870
Goodwill, Ending Balance 68,214
Pipeline  
Goodwill  
Goodwill, Beginning Balance 52,415
Goodwill, Ending Balance $ 52,415