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Acquisition - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Jul. 31, 2020 | Jun. 04, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 161,352 |  |  | $ 152,020 | $ 152,156
Mader Holdings L.P. | Joint Venture Agreement |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets |  | $ 2,040 |  |  |
Property and equipment |  | 103 |  |  |
Goodwill |  | 2,000 |  |  |
Total assets acquired |  | 4,430 |  |  |
Current liabilities assumed |  | (430) |  |  |
Deferred income tax asset |  | 287 |  |  |
Other liabilities |  | (500) |  |  |
Long term debt |  | (2,508) |  |  |
Fair value of 30% noncontrolling equity interest in Mader |  | $ 992 |  |  |
Environmental Integrated Solutions [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets |  |  | $ 6,416 |  |
Property and equipment |  |  | 26 |  |
Other assets |  |  | 44 |  |
Goodwill |  |  | 7,022 |  |
Intangible - finite life |  |  | 4,840 |  |
Total assets acquired |  |  | 18,348 |  |
Current liabilities assumed |  |  | (6,514) |  |
Deferred income tax liability |  |  | (920) |  |
Net assets acquired |  |  | $ 10,914 |  |

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