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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 890,268,000 | $ 851,783,000 | $ 1,063,911,000
Goodwill acquired |  | 38,300,000 | 13,100,000 |
Goodwill impairment |  | 0 | 225,500,000 | 0
Goodwill, accumulated impairment loss |  |  |  | 268,100,000
Non-cash expense for impairment of intangible and tangible assets, excluding goodwill |  | 0 | 7,300,000 | 0
Indefinite-lived intangible asset acquired |  | $ 70,600,000 | 38,100,000 |
Amortization periods |  | 7 years 6 months |  |
Amortization of identifiable intangible assets |  | $ 64,089,000 | 59,950,000 | 48,142,000
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 | 10.40% |  |  |
United States Electrical Construction And Facilities Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 159,512,000 | 142,545,000 | 142,545,000
Goodwill allocated |  | 17.90% |  |
Goodwill impairment |  |  | 0 |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  | $ 103,600,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  | 52,400,000 |  |
United States Mechanical Construction And Facilities Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 303,887,000 | 299,618,000 | 299,220,000
Goodwill allocated |  | 34.20% |  |
Goodwill impairment |  |  | 0 |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  | $ 185,500,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  | 95,900,000 |  |
United States Building Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 312,781,000 | 302,132,000 | 289,158,000
Goodwill allocated |  | 35.10% |  |
Weighted average cost of capital used in annual testing for impairment | 10.40% |  |  |
Goodwill impairment |  |  | 0 |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  | $ 74,500,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  | 35,800,000 |  |
Goodwill, accumulated impairment loss |  |  |  | 139,500,000
United States Industrial Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | $ 114,088,000 | 107,488,000 | 332,988,000
Goodwill allocated |  | 12.80% |  |
Weighted average cost of capital used in annual testing for impairment | 11.30% |  |  |
Goodwill impairment |  |  | $ 225,500,000 |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  | $ 25,900,000 |  |
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  | $ 9,500,000 |  |
Goodwill, accumulated impairment loss |  |  |  | $ 128,600,000
Customer relationships |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods |  | 7 years 6 months |  |
Developed technology/Vendor network |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods |  | 5 years 9 months |  |
Trade names (amortized) |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods |  | 8 years 6 months |  |
Contract backlog |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods |  | 3 months |  |

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