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Goodwill and Intangible Assets | 9 Months Ended
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Sep. 30, 2025
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, 2024 |  | $ | 205,231 |  |  | $ | 118,860 |  |  | $ | 143,698 |  |  | $ | 467,789 |
Acquisitions measurement period adjustments, net of foreign currency translation |  |  | 1,096 |  |  |  | 220 |  |  |  | (80 | ) |  |  | 1,236 |
Balance as of September 30, 2025 |  | $ | 206,327 |  |  | $ | 119,080 |  |  | $ | 143,618 |  |  | $ | 469,025 |
Amounts related to finite-lived intangible assets are as follows:
September 30, 2025 |  | Gross Balance |  |  | Accumulated Amortization |  |  | Total Intangible Assets—Net |
Customer relationships |  | $ | 264,958 |  |  | $ | 155,589 |  |  | $ | 109,369 |
Covenants not to compete |  |  | 41,529 |  |  |  | 35,787 |  |  |  | 5,742 |
Trade names |  |  | 25,939 |  |  |  | 25,056 |  |  |  | 883 |
Proprietary software |  |  | 31,201 |  |  |  | 25,227 |  |  |  | 5,974 |
Patent |  |  | 17,479 |  |  |  | 6,598 |  |  |  | 10,881 |
Total other intangible assets, net |  | $ | 381,106 |  |  | $ | 248,257 |  |  | $ | 132,849 |
December 31, 2024 |  | Gross Balance |  |  | Accumulated Amortization |  |  | Total Intangible Assets—Net |
Customer relationships |  | $ | 264,477 |  |  | $ | 138,787 |  |  | $ | 125,690 |
Covenants not to compete |  |  | 41,758 |  |  |  | 33,898 |  |  |  | 7,860 |
Trade names |  |  | 25,939 |  |  |  | 23,375 |  |  |  | 2,564 |
Proprietary software |  |  | 28,428 |  |  |  | 23,489 |  |  |  | 4,939 |
Patent |  |  | 17,479 |  |  |  | 5,776 |  |  |  | 11,703 |
Total other intangible assets, net |  | $ | 378,081 |  |  | $ | 225,325 |  |  | $ | 152,756 |
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 $7.3 million and $23.0 million for the three and nine months ended September 30, 2025, respectively, and $9.0 million and $24.6 million for the three and nine months ended September 30, 2024, respectively. Future amortization expense is estimated to be as follows for each of the five following years and thereafter:
December 31, |  |  |
2025 (remaining) |  | $ | 6,845 |
2026 |  |  | 25,635 |
2027 |  |  | 24,381 |
2028 |  |  | 18,967 |
2029 |  |  | 12,380 |
Thereafter |  |  | 44,641 |
Total |  | $ | 132,849 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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