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Goodwill and Identifiable Intangible Assets - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 990,887,000 | $ 964,893,000 | $ 979,628,000
Goodwill acquired |  | 25,900,000 | 40,700,000 |
Non-cash goodwill impairment charge |  | 0 | 57,451,000 | 0
Non-cash expense for impairment of identifiable intangible assets |  | 907,000 | 57,819,000 | 2,428,000
Non-cash impairment charge of finite-lived intangible assets |  | 900,000.0 | 0 | 0
Accumulated impairment charge |  |  |  | 210,600,000
Indefinite-lived intangible asset acquired |  | $ 36,600,000 | 56,600,000 |
Amortization periods |  | 8 years 9 months |  |
Amortization of identifiable intangible assets |  | $ 42,443,000 | 48,594,000 | 40,908,000
Domestic Segments |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Perpetual growth rate used for annual testing | 2.70% |  |  |
Domestic Construction |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Weighted average cost of capital used in annual testing for impairment | 9.80% |  |  |
United States Electrical Construction And Facilities Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 133,207,000 | 125,707,000 | 123,600,000
Goodwill allocated |  | 13.40% |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  | $ 91,700,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  | 52,500,000 |  |
Non-cash goodwill impairment charge |  |  | 0 |
United States Mechanical Construction And Facilities Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 256,321,000 | 256,265,000 | 226,596,000
Goodwill allocated |  | 25.90% |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  | $ 132,400,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  | 74,100,000 |  |
Non-cash goodwill impairment charge |  |  | 0 |
United States Building Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 274,171,000 | 255,733,000 | 244,793,000
Goodwill allocated |  | 27.70% |  |
Weighted average cost of capital used in annual testing for impairment | 9.70% |  |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  | $ 71,200,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  | 38,300,000 |  |
Non-cash goodwill impairment charge |  |  | 0 |
Accumulated impairment charge |  |  |  | 139,500,000
United States Industrial Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 327,188,000 | 327,188,000 | 384,639,000
Goodwill allocated |  | 33.00% |  |
Weighted average cost of capital used in annual testing for impairment | 10.50% |  |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  | $ 46,400,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  | $ 23,300,000 |  |
Non-cash goodwill impairment charge |  |  | 57,451,000 |
Accumulated impairment charge |  |  |  | 71,100,000
Contract backlog |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods |  | 6 months |  |
Developed technology/Vendor network |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods |  | 8 years 6 months |  |
Customer relationships |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods |  | 8 years 9 months |  |
Trade names (amortized) |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods |  | 11 years 9 months |  |
Trade names (unamortized) |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Non-cash expense for impairment of identifiable intangible assets |  | $ 0 | $ 300,000 | $ 2,400,000

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