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Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | $ 172 | $ 327 | $ 172 | $ 327 | $ 201 | $ 81
Restructuring expenses | 343 | 641 | 908 | 732 |  |
Payments for restructuring |  |  | (937) | (486) |  |
Employee Severance [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses | 343 | 641 | 908 | 732 |  |
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | 90 | 146 | 90 | 146 | 188 | 0
Restructuring expenses |  |  | 218 | 198 |  |
Payments for restructuring |  |  | (316) | (52) |  |
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | $ 82 | $ 181 | 82 | 181 | $ 13 | $ 81
Restructuring expenses |  |  | 690 | 534 |  |
Payments for restructuring |  |  | $ (621) | $ (434) |  |

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