Investment Property - Fair Value Measurement of Investment Property (Detail) - Market comparison and cost method [Member]	12 Months Ended
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

Comparable price per area, significant unobservable inputs, assets.

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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

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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

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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

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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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