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Accounts Receivable, Net - Additional Information (Detail) In Thousands, unless otherwise specified	9 Months Ended			12 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2014 CNY	Sep. 30, 2013 CNY	Dec. 31, 2013 USD ($)	Dec. 31, 2013 CNY	Dec. 31, 2012 CNY	Dec. 31, 2011 CNY	Dec. 31, 2013 General and Administration Expenses [Member] USD ($)	Dec. 31, 2013 General and Administration Expenses [Member] CNY	Dec. 31, 2012 General and Administration Expenses [Member] CNY	Dec. 31, 2011 General and Administration Expenses [Member] CNY
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions to allowance for doubtful accounts	$ (180)	(1,107)	1,387	$ 41	251	790	(591)	$ 41	251	790	206

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.5)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 5

-Article 5

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