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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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