Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Goodwill
Goodwill, Beginning Balance	$ 581,664
Goodwill acquired during the period	9,982
Goodwill, Ending Balance	591,646
Utilities
Goodwill
Goodwill, Beginning Balance	462,905
Goodwill acquired during the period	8,059
Goodwill, Ending Balance	470,964
Energy/Renewables
Goodwill
Goodwill, Beginning Balance	66,344
Goodwill acquired during the period	1,923
Goodwill, Ending Balance	68,267
Pipeline
Goodwill
Goodwill, Beginning Balance	52,415
Goodwill, Ending Balance	$ 52,415