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Commitments and Contingencies - Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | $ 1,630 | $ 492 | $ 201
Restructuring expenses | 2,306 | 1,577 | 1,438
Payments for restructuring | (1,168) | (1,286) |
Employee Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 2,306 | 1,600 | 1,400
Corporate, Non-Segment [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 1,424 | 0 | 0
Restructuring expenses | 1,424 | 0 |
Payments for restructuring | 0 | 0 |
Corporate, Non-Segment [Member] | Employee Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 1,424 |  |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 30 | 452 | 0
Restructuring expenses | 0 | 452 |
Payments for restructuring | (422) | 0 |
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 0 | 0 | 188
Restructuring expenses | 0 | 180 |
Payments for restructuring | 0 | (368) |
UNITED STATES | Operating Segments [Member] | United States Building Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 176 | 40 | $ 13
Restructuring expenses | 882 | 945 |
Payments for restructuring | (746) | $ (918) |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Building Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | $ 882 |  |

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