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Property, plant and equipment - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2017 USD ($)
Disclosure of detailed information about property, plant and equipment [Abstract]
Impairment loss	¥ 20,845	$ 3,293	¥ 3,297	¥ 2,873
Property, plant and equipment pledged to secure bank facilities	82,710		84,360		$ 13,068
Carrying value of property, plant and equipment held under finance leases	96		144		$ 15
Additions of property, plant and equipment under finance leases	¥ 0	$ 0	¥ 86

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- References

No definition available.

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- Definition

The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2016-01-13
-Paragraph 73
-Subparagraph e
-Clause v
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-URIDate 2016-03-31

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2016-01-13
-Paragraph 98
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- Definition

The increase (decrease) in the net investment in finance lease. [Refer: Net investment in finance lease]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2019-01-01
-Name IFRS
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-IssueDate 2016-01-13
-Paragraph 93
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2016-03-30&anchor=para_93&doctype=Standard
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- Definition

The amount of property, plant and equipment pledged as security for liabilities. [Refer: Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2016-01-13
-Paragraph 74
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_74_a&doctype=Standard
-URIDate 2016-03-31

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- Definition

The amount of assets recognised by the entity, which are leased under finance leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
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