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Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 741	$ 412	$ 741	$ 412	$ 1,630	$ 492
Restructuring expenses	173	374	448	464
Payments for restructuring			(1,337)	(544)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	200	400	400	500
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0	213	0	213	30	452
Restructuring expenses			0	0
Payments for restructuring			(30)	(239)
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	40	199	40	199	176	40
Restructuring expenses			448	464
Payments for restructuring			(584)	(305)
UNITED STATES | Operating Segments [Member] | Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 701	$ 0	701	0	$ 1,424	$ 0
Restructuring expenses			0	0
Payments for restructuring			$ (723)	$ 0

X

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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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