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Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | $ 1,138 | $ 736 | $ 1,138 | $ 736 | $ 1,558 | $ 1,630
Restructuring expenses | 536 | 119 | 605 | 567 |  |
Payments for restructuring |  |  | (1,025) | (1,461) |  |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | 524 | 0 | 524 | 0 | 445 | 30
Restructuring expenses |  |  | 268 | 0 |  |
Payments for restructuring |  |  | (189) | (30) |  |
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | 268 | 0 | 268 | 0 | 0 | 0
Restructuring expenses |  |  | 268 | 0 |  |
Payments for restructuring |  |  | 0 | 0 |  |
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | 0 | 35 | 0 | 35 | 412 | 176
Restructuring expenses |  |  | 69 | 567 |  |
Payments for restructuring |  |  | (481) | (708) |  |
UNITED STATES | Operating Segments [Member] | Corporate, Non-Segment [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | $ 346 | $ 701 | 346 | 701 | $ 701 | $ 1,424
Restructuring expenses |  |  | 0 | 0 |  |
Payments for restructuring |  |  | $ (355) | $ (723) |  |

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