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Schedule of Restructuring Activities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | $ 174 | $ 396 | $ 174 | $ 396 | $ 194 | $ 53
Restructuring expenses | 398 | 601 | 799 | 652 |  |
Payments for restructuring |  |  | (819) | (309) |  |
Employee Severance [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses | 400 | 500 | 580 | 600 |  |
Facility Closing [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  | 100 | 219 | 100 |  |
Corporate, Non-Segment [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | 0 | 0 | 0 | 0 | 0 | 0
Restructuring expenses |  |  | 300 | 0 |  |
Payments for restructuring |  |  | (300) | 0 |  |
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 |  |  | 300 |  |  |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | 0 | 35 | 0 | 35 | 30 | 53
Restructuring expenses |  |  | 375 | 0 |  |
Payments for restructuring |  |  | (405) | (18) |  |
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | 174 | 344 | 174 | 344 | 164 | 0
Restructuring expenses |  |  | 124 | 473 |  |
Payments for restructuring |  |  | (114) | (129) |  |
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring reserve | 0 | 17 | 0 | 17 | 0 | 0
Restructuring expenses |  |  | 0 | 179 |  |
Payments for restructuring |  |  | 0 | (162) |  |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  |  | 375 |  |  |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  |  | 205 |  |  |
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Building Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  |  | 0 |  |  |
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  |  | 0 |  |  |
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  |  | (81) |  |  |
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Building Services [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses |  |  | $ 0 |  |  |

X
- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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