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Commitments and Contingencies - Schedule of Restructuring Activities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | $ 81 | $ 281 | $ 194
Restructuring expenses | 824 | 1,168 | 647
Payments for restructuring | (1,024) | (1,081) |
Employee Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 930 | 600 | 500
Facility Closing [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses |  | 600 | 100
Reversal of restructuring expenses | (106) |  |
Corporate, Non-Segment [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 0 | 0 | 0
Restructuring expenses | 0 | 300 |
Payments for restructuring | 0 | (300) |
Corporate, Non-Segment [Member] | Employee Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 0 |  |
Corporate, Non-Segment [Member] | Facility Closing [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 0 |  |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 0 | 255 | 30
Restructuring expenses |  | 638 |
Reversal of restructuring expenses | (106) |  |
Payments for restructuring | (149) | (413) |
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 0 | 26 | 164
Restructuring expenses | 6 | 230 |
Payments for restructuring | (32) | (368) |
UNITED STATES | Operating Segments [Member] | United States Building Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 81 | 0 | $ 0
Restructuring expenses | 924 | 0 |
Payments for restructuring | (843) | $ 0 |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Electrical Construction And Facilities Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 0 |  |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Mechanical Construction And Facilities Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 6 |  |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Building Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | 924 |  |
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Electrical Construction And Facilities Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Reversal of restructuring expenses | (106) |  |
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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