Goodwill and Identifiable Intangible Assets, Net (Tables)

9 Months Ended

Sep. 30, 2021

Goodwill and Identifiable Intangible Assets, Net

Schedule of changes in the carrying amount of goodwill

The changes in the carrying amount of goodwill are as follows (in thousands):

	Mechanical Services		Electrical Services
	Segment		Segment		Total
Balance at December 31, 2019	$	234,660	$	97,787	$	332,447
Acquisitions and purchase price adjustments (See Note 5)		72,788		59,157		131,945
Balance at December 31, 2020		307,448		156,944		464,392
Acquisitions and purchase price adjustments (See Note 5)		8,089		54,483		62,572
Impact of segment reorganization		1,101		(1,101)		—
Balance at September 30, 2021	$	316,638	$	210,326	$	526,964

Schedule of future amortization expense of identifiable intangible assets

At September 30, 2021, future amortization expense of identifiable intangible assets is as follows (in thousands):

Year ended December 31—
2021 (remainder of the year)	$	11,021
2022		36,968
2023		28,495
2024		27,145
2025		24,958
Thereafter		139,512
Total	$	268,099