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Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | $ 49 | $ 474 | $ 49 | $ 474 | $ 201 | $ 81
Restructuring expenses | 46 | 539 | 954 | 1,271 |  |
Payments for restructuring |  |  | (1,106) | (878) |  |
Employee Severance [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses | 46 | 539 | 954 | 1,271 |  |
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | 0 | 293 | 0 | 293 | 188 | 0
Restructuring expenses |  |  | 181 | 401 |  |
Payments for restructuring |  |  | (369) | (108) |  |
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | $ 49 | $ 181 | 49 | 181 | $ 13 | $ 81
Restructuring expenses |  |  | 773 | 870 |  |
Payments for restructuring |  |  | $ (737) | $ (770) |  |

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