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Goodwill and Intangible Assets | 3 Months Ended
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Mar. 31, 2021
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | 7. 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, 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 |
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 |
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 $8.6 million and $5.6 million for the three months ended of March 31, 2021 and March 31, 2020, respectively. 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 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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