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Identifiable Intangible Assets from Acquisitions - Summary of Identifiable Intangible Assets from Acquisitions (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 26,530 | $ 26,530 |
Accumulated Amortization | (16,083) | (12,375) |
Impairment | (4,959) | (4,959) | $ (5,000)
Net Carrying Amount | 5,488 | 9,196 |
Customer Relationships |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 13,018 | 13,018 |
Accumulated Amortization | (6,303) | (4,693) |
Impairment | (3,430) | (3,430) |
Net Carrying Amount | 3,285 | 4,895 |
Technologies |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 9,369 | 9,369 |
Accumulated Amortization | (6,547) | (4,731) |
Impairment | (1,062) | (1,062) |
Net Carrying Amount | 1,760 | 3,576 |
Non-compete Agreements |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 3,409 | 3,409 |
Accumulated Amortization | (2,626) | (2,413) |
Impairment | (346) | (346) |
Net Carrying Amount | 437 | 650 |
Tradenames |  |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 734 | 734 |
Accumulated Amortization | (607) | (538) |
Impairment | (121) | (121) |
Net Carrying Amount | $ 6 | $ 75 |

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