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Property and Equipment, 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
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 4,130	25,350	17,647	$ 4,220	25,548	14,301	6,347

X

- Definition

Depreciation of property, plant and equipment directly related to goods produced and sold and services rendered by an entity during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration