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Revenue from Contracts with Customers (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Revenue From Contract With Customers [Line Items]
Performance obligation satisfied in previous period	$ 0	$ 0	$ 0	$ 0
Change in estimate of transaction price	0	0	0	0
Change in total estimated cost	10,500,000	$ 0	34,900,000	$ 0
Allowance for credit losses	25,270,000		25,270,000		$ 23,534,000
Contract asset impairment			0		$ 0
Remaining performance obligations	$ 7,101,461,000		7,101,461,000
2022Acquisitions
Revenue From Contract With Customers [Line Items]
Increase in contract assets from acquisitions			1,900,000
Increase in contract liabilities from acquisitions			13,600,000
Excluding2022Acquisitions
Revenue From Contract With Customers [Line Items]
Increase in net contract liabilities			176,800,000
Minimum [Member]
Revenue From Contract With Customers [Line Items]
Change in total estimated cost			1,000,000
United States Electrical Construction And Facilities Services [Member]
Revenue From Contract With Customers [Line Items]
Change in total estimated cost			26,500,000
United States Mechanical Construction And Facilities Services [Member]
Revenue From Contract With Customers [Line Items]
Change in total estimated cost			$ 8,400,000

X

- Definition

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in measure of progress which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount of increase in net contract liabilities.

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Amount of allowance for credit loss on accounts receivable.

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