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Commitments and Contingencies - Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | $ 492 | $ 201 | $ 81
Restructuring expenses | 1,577 | 1,438 | 824
Payments for restructuring | (1,286) | (1,318) |
Employee Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 1,516 |  |
Facility Closing [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 61 |  |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 452 | 0 | 0
Reversal of restructuring expenses |  | 0 |
Restructuring expenses | 452 |  |
Payments for restructuring | 0 | 0 |
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 0 | 188 | 0
Restructuring expenses | 180 | 519 |
Payments for restructuring | (368) | (331) |
UNITED STATES | Operating Segments [Member] | United States Building Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 40 | 13 | $ 81
Restructuring expenses | 945 | 919 |
Payments for restructuring | (918) | $ (987) |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Electrical Construction And Facilities Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 391 |  |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Mechanical Construction And Facilities Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 180 |  |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Building Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 945 |  |
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Electrical Construction And Facilities Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 61 |  |
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Mechanical Construction And Facilities Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 0 |  |
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Building Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | $ 0 |  |

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