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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets (Tables)

12 Months Ended

Dec. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes in the carrying amount of goodwill by reportable segment during the years ended December 31, 2022 and 2021 were as follows (in thousands):  

			United States electrical construction and facilities services segment						United States mechanical construction and facilities services segment						United States building services segment						United States industrial services segment						Total
Balance at December 31, 2020			$	142,545					$	299,618					$	302,132					$	107,488					$	851,783
Acquisitions and purchase price adjustments			24,467						4,269						9,749						—						38,485
Intersegment transfers			(7,500)						—						900						6,600						—
Balance at December 31, 2021			159,512						303,887						312,781						114,088						890,268
Acquisitions and purchase price adjustments			17,601						6,942						4,340						—						28,883
Intersegment transfers			900						4,500						(5,400)						—						—
Balance at December 31, 2022			$	178,013					$	315,329					$	311,721					$	114,088					$	919,151

Schedule of Intangible Assets

Identifiable intangible assets as of December 31, 2022 and 2021 consisted of the following (in thousands):  

			December 31, 2022
			Gross Carrying Amount						Accumulated Amortization						Accumulated Impairment Charge						Total
Customer relationships			$	762,516					$	(427,211)					$	(4,834)					$	330,471
Trade names (indefinite-lived)			289,121						—						(58,933)						230,188
Developed technology/Vendor network			95,661						(74,238)						—						21,423
Trade names (finite-lived)			33,791						(25,690)						—						8,101
Contract backlog			83,245						(79,453)						—						3,792
Total			$	1,264,334					$	(606,592)					$	(63,767)					$	593,975

			December 31, 2021
			Gross Carrying Amount						Accumulated Amortization						Accumulated Impairment Charge						Total
Customer relationships			$	717,666					$	(374,764)					$	(4,834)					$	338,068
Trade names (indefinite-lived)			274,721						—						(58,933)						215,788
Developed technology/Vendor network			95,661						(69,688)						—						25,973
Trade names (finite-lived)			32,366						(24,180)						—						8,186
Contract backlog			77,995						(76,645)						—						1,350
Total			$	1,198,409					$	(545,277)					$	(63,767)					$	589,365

Schedule of Estimated Future Amortization Expense

The following table presents the estimated future amortization expense of identifiable intangible assets in the following years (in thousands):  

2023			$	63,366
2024			59,507
2025			58,002
2026			51,883
2027			38,949
Thereafter			92,080
			$	363,787

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Tabular disclosure of finite and indefinite lived intangible assets, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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