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Investment Property - Summary of Fair Value Measurement of Investment Property (Detail) - Market comparison and cost method [member] | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Valuation techniques | Market comparison and cost method | Market comparison and cost method
Unobservable input | Comparable price: -  RMB 165 to RMB 401    (US$ 26 to US$ 63) per square foot | Comparable price: -  RMB 172 to RMB 418   (US$ 27 to US$ 65) per square foot
Inter-relationship between key unobservable inputs and fair value measurement | The estimated fair value increases with higher comparable price | The estimated fair value increases with higher comparable price

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- Definition The description of the interrelationships between unobservable inputs and of how they might magnify or mitigate the effect of changes in the unobservable inputs on the fair value measurement of assets. [Refer: Disclosure of significant unobservable inputs used in fair value measurement of assets [text block]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2021-01-01 -Paragraph 93 -Subparagraph h -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_h_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The description of the methods used to develop and substantiate the unobservable inputs used in the fair value measurement of assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 13 -IssueDate 2021-01-01 -Paragraph IE65 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_IE65_e&doctype=Illustrative%20Examples -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 13 -IssueDate 2021-01-01 -Paragraph 93 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_g&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The description of the valuation techniques (for example, the market approach, cost approach and income approach) used for the fair value measurement of assets. [Refer: Valuation techniques [member]; Cost approach [member]; Income approach [member]; Market approach [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2021-01-01 -Paragraph 93 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_d&doctype=Standard -URIDate 2021-03-24 + Details
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