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Business Combinations - Summary of Fair Value of Consideration for Acquired Business (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Oct. 01, 2020
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Business Acquisition [Line Items] |  |
Fair value of contingent consideration | $ 2,882 |
Amber Leaf Partners Inc [Member] |  |
Business Acquisition [Line Items] |  |
Fair value of contingent consideration |  | $ 2,882

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