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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, 2020 | Dec. 31, 2019
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 172 to RMB 418   (US$27 to US$65) per square foot | Comparable price: -  RMB 166 to RMB 440   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 2020-01-01 -Paragraph 93 -Subparagraph h -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_h_i&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph IE65 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_IE65_e&doctype=Illustrative%20Examples -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_g&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 93 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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