Operating Leases - Schedule of Other Information Related to Operating Leases (Detail)  | 
Mar. 31, 2021  | 
Dec. 31, 2020  | 
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| Leases, Operating [Abstract] | ||
| Weighted average remaining operating lease term | 4 years 8 months 15 days | 4 years 8 months 12 days | 
| Weighted average discount rate | 3.00% | 3.10% | 
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- References No definition available. 
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| X | ||||||||||
- Definition Weighted average discount rate for operating lease calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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| X | ||||||||||
- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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