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Commitments and Contingencies - Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 1,558	$ 1,630	$ 492
Restructuring expenses	1,523	2,306	1,577
Payments for restructuring	(1,595)	(1,168)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,500	2,300	1,600
Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	701	1,424	0
Restructuring expenses	0	1,424
Payments for restructuring	723	0
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	445	30	452
Restructuring expenses	445	0
Payments for restructuring	(30)	(422)
UNITED STATES | Operating Segments [Member] | United States Building Services
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	412	176	$ 40
Restructuring expenses	1,078	882
Payments for restructuring	$ (842)	$ (746)

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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