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Reserves - Summary of Statutory Reserves (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CNY (¥)
Disclosure of reserves within equity [Line Items]
Beginning balance	¥ 299,144
Ending balance	301,026	$ 47,560	¥ 299,144
Statutory General Reserve [Member]
Disclosure of reserves within equity [Line Items]
Beginning balance	273,438	43,202	272,515
Transfer from retained earnings	1,882	297	923
Ending balance	275,320	43,499	273,438
General Surplus Reserve [Member]
Disclosure of reserves within equity [Line Items]
Beginning balance	25,706	4,061	25,706
Ending balance	¥ 25,706	$ 4,061	¥ 25,706

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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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Balance Type:	na
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- Definition

The increase (decrease) in equity resulting from transfers to a statutory reserve. [Refer: Statutory reserve]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2016-01-13
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_106_d&doctype=Standard
-URIDate 2016-03-31

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X

- Definition

A component of equity representing reserves created based on legal requirements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2016-01-13
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_55&doctype=Standard
-URIDate 2016-03-31

+ Details

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- Details

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- Details

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