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Goodwill and Intangible Assets | 6 Months Ended
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Jun. 30, 2023
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, 2022 |  | $ | 185,116 |  |  | $ | 86,205 |  |  | $ | 52,547 |  |  | $ | 323,868 |
Goodwill acquired during the period |  |  | — |  |  |  | 7,146 |  |  |  | 37,735 |  |  |  | 44,881 |
Acquisitions measurement period adjustments |  |  | (170 | ) |  |  | (6 | ) |  |  | 12 |  |  |  | (164 | )
Foreign currency translation impact |  |  | — |  |  |  | — |  |  |  | (22 | ) |  |  | (22 | )
Balance as of June 30, 2023 |  | $ | 184,946 |  |  | $ | 93,345 |  |  | $ | 90,272 |  |  | $ | 368,563 |
Amounts related to finite-lived intangible assets are as follows:
June 30, 2023 |  | Estimated Useful Life |  | Gross Balance |  |  | Accumulated Amortization |  |  | Total Intangible Assets—Net |
Finite lived intangible assets |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | 2-15 years |  | $ | 214,821 |  |  | $ | 105,385 |  |  | $ | 109,436 |
Covenants not to compete |  | 4-5 years |  |  | 33,996 |  |  |  | 29,675 |  |  |  | 4,321 |
Trade names |  | 1-5 years |  |  | 22,213 |  |  |  | 19,371 |  |  |  | 2,842 |
Proprietary software |  | 3-5 years |  |  | 25,135 |  |  |  | 17,715 |  |  |  | 7,420 |
Patent |  | 16 years |  |  | 17,479 |  |  |  | 4,129 |  |  |  | 13,350 |
Total other intangible assets —net |  |  |  | $ | 313,644 |  |  | $ | 176,275 |  |  | $ | 137,369 |
December 31, 2022 |  | Estimated Useful Life |  | Gross Balance |  |  | Accumulated Amortization |  |  | Total Intangible Assets—Net |
Finite lived intangible assets |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | 2-15 years |  | $ | 208,024 |  |  | $ | 95,768 |  |  | $ | 112,256 |
Covenants not to compete |  | 4-5 years |  |  | 33,542 |  |  |  | 28,280 |  |  |  | 5,262 |
Trade names |  | 1-5 years |  |  | 22,061 |  |  |  | 18,256 |  |  |  | 3,805 |
Proprietary software |  | 3-5 years |  |  | 22,698 |  |  |  | 15,810 |  |  |  | 6,888 |
Patent |  | 16 years |  |  | 17,479 |  |  |  | 3,583 |  |  |  | 13,896 |
Total other intangible assets —net |  |  |  | $ | 303,804 |  |  | $ | 161,697 |  |  | $ | 142,107 |
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 $7.4 million and $14.6 million for the three and six months ended June 30, 2023, respectively, and $9.5 million and $18.9 million for the three and six months ended June 30, 2022, respectively. Future amortization expense is estimated to be as follows for each of the five following years and thereafter:
December 31, |  |  |
2023 (remaining) |  | $ | 14,027 |
2024 |  |  | 25,239 |
2025 |  |  | 18,349 |
2026 |  |  | 14,498 |
2027 |  |  | 13,921 |
Thereafter |  |  | 51,335 |
Total |  | $ | 137,369 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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