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Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 412	$ 172	$ 412	$ 172	$ 492	$ 201
Restructuring expenses	374	343	464	908
Payments for restructuring			(544)	(937)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	374	343	464	908
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	213	0	213	0	452	0
Restructuring expenses			0	0
Payments for restructuring			(239)	0
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0	90	0	90	0	188
Restructuring expenses			0	218
Payments for restructuring			0	(316)
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 199	$ 82	199	82	$ 40	$ 13
Restructuring expenses			464	690
Payments for restructuring			$ (305)	$ (621)

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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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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