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Segment Reporting (Details2) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets | $ 1,721,959 | $ 1,670,945 | $ 1,631,699
UNITED STATES |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets | 1,710,457 | 1,659,635 | 1,617,762
Operating Segments [Member] | UNITED STATES | United States Electrical Construction And Facilities Services |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets | 290,896 | 302,448 | 237,766
Operating Segments [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets | 526,567 | 517,649 | 514,065
Operating Segments [Member] | UNITED STATES | United States Building Services |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets | 574,917 | 497,892 | 500,368
Operating Segments [Member] | UNITED STATES | United States Industrial Services |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets | 318,077 | 341,646 | 365,563
Operating Segments [Member] | UNITED KINGDOM | United Kingdom Building Services |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets | 9,761 | 10,320 | 11,402
Corporate, Non-Segment [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets | $ 1,741 | $ 990 | $ 2,535

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