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Financial Risk Management Objectives and Policies - Foreign Currency Risk Sensitivity Analysis Assuming 10% Strengthening of Major Currencies against Functional Currency (Detail) - Foreign currency risk [Member] ¥ in Thousands, $ in Thousands	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CNY (¥)
Singapore Dollar [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Effect on profit before tax	¥ 41,585	$ 6,570	¥ 8,422
Euro [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Effect on profit before tax	(937)	(148)	231
USD [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Effect on profit before tax	4,522	714	(8,765)
Renminbi [Member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Effect on profit before tax	¥ (3,504)	$ (554)	¥ 3,027

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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.

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- Definition

The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2016-01-13
-Paragraph B8
-Subparagraph c
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-URIDate 2016-03-31

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