Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Amounts Related to Goodwill

Amounts related to goodwill are as follows:

	Assessment, Permitting and Response		Measurement and Analysis		Remediation and Reuse		Total
Balance as of December 31, 2020	$	162,156	$	69,054	$	43,457	$	274,667
Goodwill acquired during the period		—		—		7,532		7,532
Balance as of March 31, 2021	$	162,156	$	69,054	$	50,989	$	282,199

Schedule of Amounts Related to Finite-Lived Intangible Assets

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

March 31, 2021	Estimated Useful Life	Gross Balance		Accumulated Amortization		Total Intangible Assets—Net
Finite lived intangible assets
Customer relationships	2–15 years	$	173,502	$	58,294	$	115,208
Covenants not to compete	4–5 years		30,864		22,471		8,393
Trade names	1–5 years		17,459		13,445		4,014
Proprietary software	3–5 years		21,260		7,368		13,892
Patent	16 years		17,479		1,671		15,808
Total other intangible assets    —net		$	260,564	$	103,249	$	157,315

December 31, 2020	Estimated Useful Life	Gross Balance		Accumulated Amortization		Total Intangible Assets—Net
Finite lived intangible assets
Customer relationships	7–15 years	$	164,782	$	53,446	$	111,336
Covenants not to compete	4–5 years		29,942		21,469		8,473
Trade names	1–5 years		16,938		12,849		4,089
Proprietary software	3–5 years		21,007		6,132		14,875
Patent	16 years		17,479		1,398		16,081
Total other intangible assets    —net		$	250,148	$	95,294	$	154,854

Schedule of Future Amortization Expense

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

December 31,
2021 (remaining)	$	22,667
2022		26,545
2023		21,276
2024		18,096
2025		11,854
2026 and thereafter		56,877
Total	$	157,315