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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Oct. 01, 2022
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill | $ 919,151,000 | $ 890,268,000 | $ 851,783,000 |
Goodwill impairment | 0 | 0 |  |
Goodwill, accumulated impairment loss |  |  | 493,600,000 |
Other asset impairment charges, excluding goodwill | $ 0 | 0 | 7,300,000 |
Amortization periods | 7 years |  |  |
Amortization of identifiable intangible assets | $ 61,315,000 | 64,089,000 | 59,950,000 |
2022Acquisitions |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill | 28,900,000 |  |  |
Identifiable intangible assets acquired | 65,900,000 |  |  |
2021 Acquisitions |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill |  | 38,300,000 |  |
Identifiable intangible assets acquired |  | 70,600,000 |  |
Domestic Segments |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Perpetual growth rate used for annual testing, percentage |  |  |  | 2.50%
Domestic Construction |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Weighted average cost of capital used in annual testing, percentage |  |  |  | 10.30%
United States Electrical Construction And Facilities Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill | $ 178,013,000 | 159,512,000 | 142,545,000 |
Goodwill allocated, percentage | 19.40% |  |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  |  |  | $ 90,900,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  |  |  | 45,000,000
United States Mechanical Construction And Facilities Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill | $ 315,329,000 | 303,887,000 | 299,618,000 |
Goodwill allocated, percentage | 34.30% |  |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  |  |  | 172,100,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  |  |  | $ 94,200,000
United States Building Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill | $ 311,721,000 | 312,781,000 | 302,132,000 |
Goodwill allocated, percentage | 33.90% |  |  |
Weighted average cost of capital used in annual testing, percentage |  |  |  | 10.20%
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  |  |  | $ 92,800,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  |  |  | $ 48,100,000
Goodwill, accumulated impairment loss |  |  | 139,500,000 |
United States Industrial Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill | $ 114,088,000 | $ 114,088,000 | 107,488,000 |
Goodwill allocated, percentage | 12.40% |  |  |
Weighted average cost of capital used in annual testing, percentage |  |  |  | 11.20%
Goodwill impairment |  |  | 225,500,000 |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  |  |  | $ 24,100,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  |  |  | $ 9,200,000
Goodwill, accumulated impairment loss |  |  | $ 354,100,000 |
Customer relationships |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods | 7 years 3 months |  |  |
Developed technology/Vendor network |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods | 4 years 9 months |  |  |
Trade names (finite-lived) |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods | 7 years |  |  |
Contract backlog |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods | 1 year |  |  |

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