Acquisitions, Goodwill and Other Intangible Assets - Summary of Net Change in Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands  | 
3 Months Ended | |
|---|---|---|
Mar. 31, 2021  | 
Mar. 31, 2020  | 
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| Goodwill [Roll Forward] | ||
| Beginning balance | $ 33,375 | $ 15,072 | 
| Additions from acquisitions | 671 | 3,990 | 
| Impairment losses | 0 | 0 | 
| Ending balance | $ 34,046 | $ 19,062 | 
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available. 
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