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Commitments and Contingencies - Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | $ 1,558 | $ 1,630 | $ 492
Restructuring expenses | 1,523 | 2,306 | 1,577
Payments for restructuring | (1,595) | (1,168) |
Employee Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 1,500 | 2,300 | 1,600
Corporate, Non-Segment [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 701 | 1,424 | 0
Restructuring expenses | 0 | 1,424 |
Payments for restructuring | 723 | 0 |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 445 | 30 | 452
Restructuring expenses | 445 | 0 |
Payments for restructuring | (30) | (422) |
UNITED STATES | Operating Segments [Member] | United States Building Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 412 | 176 | $ 40
Restructuring expenses | 1,078 | 882 |
Payments for restructuring | $ (842) | $ (746) |

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