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Investment Property - Summary of Fair Value Measurement of Investment Property (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018 ¥ / ft² $ / ft²	Dec. 31, 2017 ¥ / ft²
Renminbi [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	156	151
Renminbi [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	428	415
USD [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	23
USD [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	64

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- Definition

Comparable price per area, significant unobservable inputs, assets.

+ References

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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

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