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Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 315	$ 236	$ 492	$ 201
Restructuring expenses	90	565
Payments for restructuring	(267)	(530)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	90	565
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	305	0	452	0
Restructuring expenses	0	0
Payments for restructuring	(147)	0
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0	140	0	188
Restructuring expenses	0	62
Payments for restructuring	0	(110)
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	10	96	$ 40	$ 13
Restructuring expenses	90	503
Payments for restructuring	$ (120)	$ (420)

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1
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+ References

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+ References

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-Topic 420
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