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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Narrative (Details) - USD ($) |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2020 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill and Intangible Assets[Line Items] |  |  |  |  |
Goodwill |  |  | $ 851,783,000 | $ 1,063,911,000 | $ 990,887,000
Goodwill acquired |  |  | 13,000,000.0 | 73,100,000 |
Non-cash goodwill impairment charge |  |  | 225,500,000 | 0 | 0
Goodwill, accumulated impairment loss |  |  |  |  | 268,100,000
Non-cash expense for impairment of intangible and tangible assets, excluding goodwill |  |  | 7,300,000 |  |
Non-cash impairment charge of finite-lived intangible assets |  |  |  | 0 | 900,000
Indefinite-lived intangible asset acquired |  |  | $ 38,100,000 | 171,300,000 |
Amortization periods |  |  | 7 years 9 months |  |
Amortization of identifiable intangible assets |  |  | $ 59,950,000 | 48,142,000 | 42,443,000
Domestic Segments |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |
Perpetual growth rate used for annual testing | 2.00% |  |  |  |
Domestic Construction |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |
Weighted average cost of capital used in annual testing for impairment | 10.60% |  |  |  |
United States Electrical Construction And Facilities Services |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |
Goodwill |  |  | $ 142,545,000 | 142,545,000 | 133,207,000
Goodwill allocated |  |  | 16.70% |  |
Non-cash goodwill impairment charge |  |  | $ 0 |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  |  | 63,300,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  |  | 31,000,000.0 |  |
United States Mechanical Construction And Facilities Services |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |
Goodwill |  |  | $ 299,618,000 | 299,220,000 | 256,321,000
Goodwill allocated |  |  | 35.20% |  |
Non-cash goodwill impairment charge |  |  | $ 0 |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  |  | 115,900,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  |  | 58,900,000 |  |
United States Building Services |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |
Goodwill |  |  | $ 302,132,000 | 289,158,000 | 274,171,000
Goodwill allocated |  |  | 35.50% |  |
Weighted average cost of capital used in annual testing for impairment | 10.40% |  |  |  |
Non-cash goodwill impairment charge |  |  | $ 0 |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  |  | 69,900,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  |  | 33,500,000 |  |
Goodwill, accumulated impairment loss |  |  |  |  | 139,500,000
United States Industrial Services |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |
Goodwill |  |  | $ 107,488,000 | 332,988,000 | 327,188,000
Goodwill allocated |  |  | 12.60% |  |
Weighted average cost of capital used in annual testing for impairment | 11.60% | 12.00% |  |  |
Perpetual growth rate used for annual testing |  | 2.00% |  |  |
Non-cash goodwill impairment charge |  |  | $ 225,500,000 |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  |  | 23,200,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  |  | 9,700,000 |  |
Goodwill, accumulated impairment loss |  |  |  |  | 128,600,000
Non-cash expense for impairment of intangible and tangible assets, excluding goodwill |  |  | 4,800,000 |  |
Non-cash expense for impairment of property, plant and equipment |  |  | $ 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 |  |  | 6 years 9 months |  |
Customer relationships |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |
Amortization periods |  |  | 8 years |  |
Trade names (amortized) |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |
Amortization periods |  |  | 9 years 9 months |  |
Trade names (unamortized) |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |
Non-cash expense for impairment of identifiable intangible assets |  |  |  | $ 0 | $ 0
Trade names (unamortized) | United States Electrical Construction And Facilities Services |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |
Non-cash expense for impairment of identifiable intangible assets |  |  | $ 2,500,000 |  |
Trade names (unamortized) | United States Industrial Services |  |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |  |
Non-cash expense for impairment of identifiable intangible assets |  |  | $ 4,200,000 |  |

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