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

12 Months Ended

Dec. 31, 2023

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, 2023 and 2022 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, 2021			$	159,512					$	303,887					$	312,781					$	114,088					$	890,268
Acquisitions			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
Acquisitions			—						4,524						32,874						—						37,398
Intersegment transfers			—						(1,500)						1,500						—						—
Balance at December 31, 2023			$	178,013					$	318,353					$	346,095					$	114,088					$	956,549

Schedule of Intangible Assets

Identifiable intangible assets as of December 31, 2023 and 2022 consisted of the following (in thousands):  

			December 31, 2023
			Gross Carrying Amount						Accumulated Amortization						Accumulated Impairment Charge						Total
Customer relationships			$	807,766					$	(482,594)					$	(4,834)					$	320,338
Trade names (indefinite-lived)			299,271						—						(58,933)						240,338
Developed technology/Vendor network			95,661						(78,788)						—						16,873
Trade names (finite-lived)			35,991						(27,800)						—						8,191
Contract backlog			84,845						(84,553)						—						292
Total			$	1,323,534					$	(673,735)					$	(63,767)					$	586,032

			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

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):  

2024			$	63,873
2025			62,369
2026			55,782
2027			42,583
2028			33,818
Thereafter			87,269
			$	345,694

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