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Goodwill and Identifiable Intangible Assets - Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2016 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 979,628,000 |  |  |  | $ 843,170,000 |  |  |  | $ 979,628,000 | $ 843,170,000 | $ 834,102,000
Goodwill acquired |  |  |  |  |  |  |  |  |  | 135,900,000 | 9,600,000 |
Non-cash goodwill impairment charge |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Non-cash expense for impairment of identifiable intangible assets |  | 2,428,000 | $ 0 | $ 0 | $ 0 | 0 | $ 0 | $ 0 | $ 0 | 2,428,000 | 0 | 1,471,000
Non-cash impairment charge of finite-lived intangible assets |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Accumulated impairment charge |  |  |  |  |  |  |  |  |  |  |  | 210,600,000
Indefinite-lived intangible asset acquired |  |  |  |  |  |  |  |  |  | $ 57,900,000 | 8,700,000 |
Amortization periods |  |  |  |  |  |  |  |  |  | 10 years 6 months |  |
Amortization of identifiable intangible assets |  |  |  |  |  |  |  |  |  | $ 40,908,000 | 37,895,000 | 37,966,000
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 |  | 384,639,000 |  |  |  | 384,639,000 |  |  |  | $ 384,639,000 | 384,639,000 | 384,639,000
Goodwill allocated |  |  |  |  |  |  |  |  |  | 39.30% |  |
Weighted average cost of capital used in annual testing for impairment | 11.50% |  |  |  |  |  |  |  |  |  |  |
Accumulated impairment charge |  |  |  |  |  |  |  |  |  |  |  | 71,100,000
United States Building Services |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 244,793,000 |  |  |  | 228,637,000 |  |  |  | $ 244,793,000 | 228,637,000 | 228,385,000
Goodwill allocated |  |  |  |  |  |  |  |  |  | 25.00% |  |
Weighted average cost of capital used in annual testing for impairment | 11.00% |  |  |  |  |  |  |  |  |  |  |
Accumulated impairment charge |  |  |  |  |  |  |  |  |  |  |  | 139,500,000
Domestic Construction |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average cost of capital used in annual testing for impairment | 11.40% |  |  |  |  |  |  |  |  |  |  |
United States Mechanical Construction And Facilities Services |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 226,596,000 |  |  |  | 226,071,000 |  |  |  | $ 226,596,000 | 226,071,000 | 217,255,000
Goodwill allocated |  |  |  |  |  |  |  |  |  | 23.10% |  |
United States Electrical Construction And Facilities Services |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 123,600,000 |  |  |  | $ 3,823,000 |  |  |  | $ 123,600,000 | 3,823,000 | 3,823,000
Goodwill allocated |  |  |  |  |  |  |  |  |  | 12.60% |  |
Developed technology/Vendor network |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods |  |  |  |  |  |  |  |  |  | 10 years 6 months |  |
Customer relationships |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods |  |  |  |  |  |  |  |  |  | 10 years 3 months |  |
Non-competition agreements |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods |  |  |  |  |  |  |  |  |  | 1 year 3 months |  |
Trade names (amortized) |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods |  |  |  |  |  |  |  |  |  | 10 years 6 months |  |
Trade names (unamortized) |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash expense for impairment of identifiable intangible assets |  |  |  |  |  |  |  |  |  | $ 2,400,000 | $ 0 | $ 1,500,000

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