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Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 1,464	$ 315	$ 1,630	$ 492
Restructuring expenses	275	90
Payments for restructuring	(441)	(267)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	300	100
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0	305	30	452
Restructuring expenses	0	0
Payments for restructuring	(30)	(147)
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	70	10	176	40
Restructuring expenses	275	90
Payments for restructuring	(381)	(120)
UNITED STATES | Operating Segments [Member] | Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	1,394	0	$ 1,424	$ 0
Restructuring expenses	0	0
Payments for restructuring	$ (30)	$ 0

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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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