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Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 652	$ 741	$ 652	$ 741	$ 1,558	$ 1,630
Restructuring expenses	0	173	69	448
Payments for restructuring			(975)	(1,337)
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	306	0	306	0	445	30
Restructuring expenses			0	0
Payments for restructuring			(139)	(30)
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0	40	0	40	412	176
Restructuring expenses			69	448
Payments for restructuring			(481)	(584)
UNITED STATES | Operating Segments [Member] | Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 346	$ 701	346	701	$ 701	$ 1,424
Restructuring expenses			0	0
Payments for restructuring			$ (355)	$ (723)

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.

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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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