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Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Information
Number of reportable segments | segment			2
Revenue	$ 714,099	$ 706,918	$ 2,157,698	$ 1,895,693
Gross Profit	147,196	142,702	409,984	369,383
Capital Expenditures			19,459	22,641
Total Assets	1,677,969		1,677,969		$ 1,505,012
Operating | Mechanical Services Segment
Segment Information
Revenue	621,140	590,016	1,809,304	1,677,632
Gross Profit	138,655	128,501	383,334	344,632
Operating | Electrical Services
Segment Information
Revenue	92,959	116,902	348,394	218,061
Gross Profit	$ 8,541	$ 14,201	$ 26,650	$ 24,751

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