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Investments - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Currency risk [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Risk exposure associated with instruments | $ 0 |
Other price risk [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Risk exposure associated with instruments | $ 0 |
Bottom of range [member] | Time deposits denominated with a contractual maturity of less than 365 days [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Interest rates on time deposits | 0.27% | 2.00%
Bottom of range [member] | Time deposits with a contractual maturity of more than 365 days [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Interest rates on time deposits | 1.20% | 3.25%
Top of range [member] | Time deposits denominated with a contractual maturity of less than 365 days [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Interest rates on time deposits | 4.38% | 3.75%
Top of range [member] | Time deposits with a contractual maturity of more than 365 days [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Interest rates on time deposits | 4.25% | 4.38%
Bottom of range Bonds with semiannual interest payment [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Semiannual interest payment, interest rates | 0.21% | 2.06%
Top of range Bonds with semiannual interest payment [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Semiannual interest payment, interest rates | 3.32% | 3.32%

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- Definition The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph B8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_B8_c&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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