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Goodwill and Identifiable Intangible Assets - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 1,063,911,000 | $ 990,887,000 | $ 964,893,000
Goodwill acquired |  | 72,700,000 | 26,300,000 |
Non-cash goodwill impairment charge |  | 0 | 0 | 57,500,000
Non-cash expense for impairment of identifiable intangible assets |  | 0 | 907,000 | 57,819,000
Non-cash impairment charge of finite-lived intangible assets |  | 0 | 900,000 | 0
Goodwill, accumulated impairment loss |  |  |  | 268,100,000
Indefinite-lived intangible asset acquired |  | $ 171,300,000 | 36,600,000 |
Amortization periods |  | 8 years 6 months |  |
Amortization of identifiable intangible assets |  | $ 48,142,000 | 42,443,000 | 48,594,000
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 | 9.50% |  |  |
United States Electrical Construction And Facilities Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 142,545,000 | 133,207,000 | 125,707,000
Goodwill allocated |  | 13.40% |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  | $ 108,800,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  | 61,400,000 |  |
United States Mechanical Construction And Facilities Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 299,220,000 | 256,321,000 | 256,265,000
Goodwill allocated |  | 28.10% |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  | $ 156,700,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  | 90,500,000 |  |
United States Building Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 289,158,000 | 274,171,000 | 255,733,000
Goodwill allocated |  | 27.20% |  |
Weighted average cost of capital used in annual testing for impairment | 9.10% |  |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  | $ 98,000,000.0 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  | 55,700,000 |  |
Goodwill, accumulated impairment loss |  |  |  | 139,500,000
United States Industrial Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 332,988,000 | 327,188,000 | 327,188,000
Goodwill allocated |  | 31.30% |  |
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 |  | $ 40,300,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  | $ 20,500,000 |  |
Goodwill, accumulated impairment loss |  |  |  | 128,600,000
Contract backlog |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods |  | 9 months |  |
Developed technology/Vendor network |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods |  | 7 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 |  | 10 years 9 months |  |
Trade names (unamortized) |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Non-cash expense for impairment of identifiable intangible assets |  | $ 0 | $ 0 | $ 300,000

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