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Commitments and Contingencies - Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 2,697	$ 1,558	$ 1,630
Restructuring expenses	2,214	1,523	2,306
Payments for restructuring	(1,075)	(1,595)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	2,200	1,500	2,300
Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	346	701	1,424
Restructuring expenses	0	0
Payments for restructuring	(355)	(723)
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	1,278	445	30
Restructuring expenses	1,072	445
Payments for restructuring	(239)	(30)
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	1,073	0	0
Restructuring expenses	1,073	0
Payments for restructuring	0	0
UNITED STATES | Operating Segments [Member] | United States Building Services
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0	412	$ 176
Restructuring expenses	69	1,078
Payments for restructuring	$ (481)	$ (842)

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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