Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

8. GOODWILL AND INTANGIBLE ASSETS

Amounts related to goodwill are as follows:

	Assessment, Permitting and Response			Measurement and Analysis		Remediation and Reuse		Total
Balance as of December 31, 2021	$	176,541		$	83,770	$	51,633	$	311,944
Goodwill acquired during the period		4,764			2,158		150		7,072
Acquisitions measurement period adjustments		(899	)		296		—		(603	)
Balance as of September 30, 2022	$	180,406		$	86,224	$	51,783	$	318,413

Amounts related to finite-lived intangible assets are as follows:

September 30, 2022	Estimated Useful Life	Gross Balance		Accumulated Amortization		Total Intangible Assets—Net
Finite lived intangible assets
Customer relationships	2-15 years	$	204,926	$	90,572	$	114,354
Covenants not to compete	4-5 years		33,286		27,523		5,763
Trade names	1-5 years		21,673		17,442		4,231
Proprietary software	3-5 years		22,469		14,719		7,750
Patent	16 years		17,479		3,309		14,170
Total other intangible assets    —net		$	299,833	$	153,565	$	146,268

December 31, 2021	Estimated Useful Life	Gross Balance		Accumulated Amortization		Total Intangible Assets—Net
Finite lived intangible assets
Customer relationships	2-15 years	$	196,323	$	74,010	$	122,313
Covenants not to compete	4-5 years		32,622		25,113		7,509
Trade names	1-5 years		20,403		15,139		5,264
Proprietary software	3-5 years		22,077		11,155		10,922
Patent	16 years		17,479		2,490		14,989
Total other intangible assets    —net		$	288,904	$	127,907	$	160,997

Intangible assets with finite lives are stated at cost, less accumulated amortization and impairment losses, if any. These intangible assets are amortized using the straight-line method over the estimated useful lives of the assets. Amortization expense was $8.7 million and $27.6 million for the three and nine months ended September 30, 2022, respectively, and $8.9 million and $25.9 million for the three and nine months ended September 30, 2021, respectively.

Future amortization expense is estimated to be as follows for each of the five following years and thereafter:

December 31,
2022 (remaining)		8,135
2023		28,163
2024		23,588
2025		16,897
2026 and thereafter		69,485
Total	$	146,268