Segment Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Information
Number of reportable segments | segment	2
Total Assets	$ 2,597,478	$ 2,209,114
Revenue	4,140,364	3,073,636	$ 2,856,659
Gross Profit	741,608	563,207	546,983
Capital Expenditures	48,359	22,330	24,131
Operating | Mechanical Services Segment
Segment Information
Total Assets	1,741,135	1,452,527
Revenue	3,178,475	2,542,623	2,430,632
Gross Profit	580,619	486,346	513,760
Capital Expenditures	43,532	19,408	22,561
Operating | Electrical Services Industry
Segment Information
Total Assets	790,040	690,364
Revenue	961,889	531,013	426,027
Gross Profit	160,989	76,861	33,223
Capital Expenditures	4,101	2,413	944
Corporate & Eliminations
Segment Information
Total Assets	66,303	66,223
Capital Expenditures	$ 726	$ 509	$ 626