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Goodwill and Identifiable Intangible Assets - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2015 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 843,170 |  |  |  | $ 834,102 |  |  |  | $ 843,170 | $ 834,102 | $ 834,825
Goodwill acquired |  |  |  |  |  |  |  |  |  | 9,100 |  |
Non-cash goodwill impairment charge |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Non-cash expense for impairment of identifiable intangible assets |  | 0 | $ 0 | $ 0 | $ 0 | 1,471 | $ 0 | $ 0 | $ 0 | 0 | 1,471 | 0
Non-cash impairment charge of finite-lived intangible assets |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Accumulated impairment charge |  |  |  |  |  |  |  |  |  |  |  | 210,600
Indefinite-lived intangible asset acquired |  |  |  |  |  |  |  |  |  | $ 8,700 | 0 |
Amortization periods |  |  |  |  |  |  |  |  |  | 11 years |  |
Amortization of identifiable intangible assets |  |  |  |  |  |  |  |  |  | $ 37,895 | 37,966 | 31,028
Domestic Segments |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Perpetual growth rate used for annual testing | 2.70% |  |  |  |  |  |  |  |  |  |  |
United States Industrial Services |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 384,639 |  |  |  | 384,639 |  |  |  | $ 384,639 | 384,639 | 384,543
Goodwill allocated |  |  |  |  |  |  |  |  |  | 45.60% |  |
Weighted average cost of capital used in annual testing for impairment | 11.00% |  |  |  |  |  |  |  |  |  |  |
Accumulated impairment charge |  |  |  |  |  |  |  |  |  |  |  | 71,100
United States Building Services |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 228,637 |  |  |  | 228,385 |  |  |  | $ 228,637 | 228,385 | 229,204
Goodwill allocated |  |  |  |  |  |  |  |  |  | 27.10% |  |
Weighted average cost of capital used in annual testing for impairment | 11.10% |  |  |  |  |  |  |  |  |  |  |
Accumulated impairment charge |  |  |  |  |  |  |  |  |  |  |  | 139,500
Domestic Construction |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average cost of capital used in annual testing for impairment | 11.10% |  |  |  |  |  |  |  |  |  |  |
United States Mechanical Construction And Facilities Services |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 226,071 |  |  |  | 217,255 |  |  |  | $ 226,071 | 217,255 | 217,255
Goodwill allocated |  |  |  |  |  |  |  |  |  | 26.80% |  |
United States Electrical Construction And Facilities Services |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 3,823 |  |  |  | $ 3,823 |  |  |  | $ 3,823 | 3,823 | 3,823
Goodwill allocated |  |  |  |  |  |  |  |  |  | 0.50% |  |
Developed technology/Vendor network |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods |  |  |  |  |  |  |  |  |  | 11 years 6 months |  |
Customer relationships |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods |  |  |  |  |  |  |  |  |  | 11 years |  |
Non-competition agreements |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods |  |  |  |  |  |  |  |  |  | 1 year 6 months |  |
Trade names (amortized) |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods |  |  |  |  |  |  |  |  |  | 4 years |  |
Trade names (unamortized) |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash expense for impairment of identifiable intangible assets |  |  |  |  |  |  |  |  |  | $ 0 | $ 1,471 | $ 0

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