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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Oct. 01, 2023
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill | $ 956,549,000 | $ 919,151,000 | $ 890,268,000 |
Goodwill impairment | $ 0 | 0 | 0 |
Goodwill, accumulated impairment loss |  |  | 493,600,000 |
Amortization periods | 7 years |  |  |
Amortization of identifiable intangible assets | $ 67,143,000 | 61,315,000 | 64,089,000 |
Indefinite-Lived Intangible Assets |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Other asset impairment charges, excluding goodwill | 0 | 0 | 0 |
Finite-Lived Intangible Assets |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Other asset impairment charges, excluding goodwill | 0 | 0 | 0 |
Long-Lived Assets |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Other asset impairment charges, excluding goodwill | 2,400,000 | 0 | 0 |
2023 Acquisitions |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill | 37,400,000 |  |  |
Identifiable intangible assets acquired | 59,200,000 |  |  |
2022 Acquisitions |  |  |  |
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 |  |  |  | 10.90%
United States Electrical Construction And Facilities Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill | $ 178,013,000 | 178,013,000 | 159,512,000 |
Goodwill allocated, percentage | 18.60% |  |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  |  |  | $ 115,200,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  |  |  | 56,500,000
United States Mechanical Construction And Facilities Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill | $ 318,353,000 | 315,329,000 | 303,887,000 |
Goodwill allocated, percentage | 33.30% |  |  |
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  |  |  | 249,900,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  |  |  | $ 137,100,000
United States Building Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill | $ 346,095,000 | 311,721,000 | 312,781,000 |
Goodwill allocated, percentage | 36.20% |  |  |
Weighted average cost of capital used in annual testing, percentage |  |  |  | 11.20%
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  |  |  | $ 84,200,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  |  |  | $ 40,400,000
Goodwill, accumulated impairment loss |  |  | 139,500,000 |
United States Industrial Services |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Goodwill | $ 114,088,000 | $ 114,088,000 | 114,088,000 |
Goodwill allocated, percentage | 11.90% |  |  |
Weighted average cost of capital used in annual testing, percentage |  |  |  | 11.00%
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital |  |  |  | $ 25,200,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate |  |  |  | $ 9,300,000
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 | 3 years 9 months |  |  |
Trade names (finite-lived) |  |  |  |
Goodwill and Intangible Assets[Line Items] |  |  |  |
Amortization periods | 5 years 9 months |  |  |

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