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Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 209	$ 49	$ 209	$ 49	$ 492	$ 201
Restructuring expenses	229	46	693	954
Payments for restructuring			(976)	(1,106)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	200	100	700	1,000
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	122	0	122	0	452	0
Restructuring expenses			0	0
Payments for restructuring			(330)	0
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0	0	0	0	0	188
Restructuring expenses			0	181
Payments for restructuring			0	(369)
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 87	$ 49	87	49	$ 40	$ 13
Restructuring expenses			693	773
Payments for restructuring			$ (646)	$ (737)

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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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