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Business Combinations - Schedule of Valuation of Net Assets Acquired (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Oct. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Identifiable intangible assets: |  |  |
Goodwill | $ 32,510 |  | $ 26,106
Amber Leaf Partners Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash on hand |  | $ 319 |
Working capital assets, net of liabilities |  | 1,153 |
Identifiable intangible assets: |  |  |
Identifiable intangible assets |  | 4,670 |
Goodwill |  | 6,404 |
Net Assets Acquired |  | 12,546 |
Amber Leaf Partners Inc [Member] | Client Relationships [Member] |  |  |
Identifiable intangible assets: |  |  |
Identifiable intangible assets |  | 2,970 |
Amber Leaf Partners Inc [Member] | Covenant Not-to-Compete [Member] |  |  |
Identifiable intangible assets: |  |  |
Identifiable intangible assets |  | 440 |
Amber Leaf Partners Inc [Member] | Trade Name [Member] |  |  |
Identifiable intangible assets: |  |  |
Identifiable intangible assets |  | 490 |
Amber Leaf Partners Inc [Member] | Technology [Member] |  |  |
Identifiable intangible assets: |  |  |
Identifiable intangible assets |  | $ 770 |

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