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Schedule of Restructuring Activities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve | $ 3,904 | $ 1,372 | $ 4,879 | $ 53
Restructuring expenses | 909 | 1,363 |  |
Payments for restructuring | (1,401) | (38) |  |
Restructuring settled without cash | (483) | (6) |  |
United States Electrical Construction And Facilities Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve | 24 | 47 | 30 | 53
Restructuring expenses | 0 | 0 |  |
Payments for restructuring | 0 | 0 |  |
Restructuring settled without cash | (6) | (6) |  |
United States Mechanical Construction And Facilities Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve | 0 | 0 | 164 | 0
Restructuring expenses | (76) | 0 |  |
Payments for restructuring | 0 | 0 |  |
Restructuring settled without cash | (88) | 0 |  |
United States Building Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve | 0 | 0 | 0 | 0
Restructuring expenses | 0 | 38 |  |
Payments for restructuring | 0 | (38) |  |
Restructuring settled without cash | 0 | 0 |  |
United Kingdom Construction And Building Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve | 3,580 | 1,325 | 4,685 | 0
Restructuring expenses | 685 | 1,325 |  |
Payments for restructuring | (1,401) | 0 |  |
Restructuring settled without cash | (389) | 0 |  |
Corporate, Non-Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve | 300 | 0 | 0 | 0
Restructuring expenses | 300 | 0 |  |
Payments for restructuring | 0 | 0 |  |
Restructuring settled without cash | 0 | 0 |  |
Employee Severance [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 685 | 1,400 |  |
Employee Severance [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 0 |  |  |
Employee Severance [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 0 |  |  |
Employee Severance [Member] | United States Building Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 0 |  |  |
Employee Severance [Member] | United Kingdom Construction And Building Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 685 |  |  |
Employee Severance [Member] | Corporate, Non-Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 0 |  |  |
Facility Closing [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 224 |  |  |
Facility Closing [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 0 |  |  |
Facility Closing [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | (76) |  |  |
Facility Closing [Member] | United States Building Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 0 |  |  |
Facility Closing [Member] | United Kingdom Construction And Building Services [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | 0 |  |  |
Facility Closing [Member] | Corporate, Non-Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses | $ 300 |  |  |

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- 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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- Definition Amount of consideration other than cash used to fully or partially settle an accrued restructuring cost. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 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)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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