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Investment Property - Fair Value Measurement of Investment Property (Detail) - Market comparison and cost method [Member] | 12 Months Ended
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Dec. 31, 2017 ¥ / ft² $ / ft² | Dec. 31, 2016 ¥ / ft²
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: - Land: RMB 24 to RMB 34 (US$4 to US$5) per square foot - Retail: RMB 352 to RMB 859 (US$56 to US$139) per square foot | Comparable price: - Land: RMB 24 to RMB 34 per square foot - Retail: RMB 337 to RMB 847 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
Renminbi [Member] | Land [Member] | Bottom of range [Member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items] |  |
Comparable price per square foot | ¥ / ft² | 24 | 24
Renminbi [Member] | Land [Member] | Top of range [Member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items] |  |
Comparable price per square foot | ¥ / ft² | 34 | 34
Renminbi [Member] | Retail [Member] | Bottom of range [Member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items] |  |
Comparable price per square foot | ¥ / ft² | 352 | 337
Renminbi [Member] | Retail [Member] | Top of range [Member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items] |  |
Comparable price per square foot | ¥ / ft² | 859 | 847
USD [Member] | Land [Member] | Bottom of range [Member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items] |  |
Comparable price per square foot | $ / ft² | 4 |
USD [Member] | Land [Member] | Top of range [Member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items] |  |
Comparable price per square foot | $ / ft² | 5 |
USD [Member] | Retail [Member] | Bottom of range [Member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items] |  |
Comparable price per square foot | $ / ft² | 56 |
USD [Member] | Retail [Member] | Top of range [Member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [Line Items] |  |
Comparable price per square foot | $ / ft² | 139 |

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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 2016-01-13 -Paragraph 93 -Subparagraph h -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2016-03-30&anchor=para_93_h_i&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph IE65 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2016-03-30&anchor=para_IE65_e&doctype=Illustrative%20Examples -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 93 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2016-03-30&anchor=para_93_d&doctype=Standard -URIDate 2016-03-31 + Details
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