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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

X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

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+ References

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