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Short-term deposits (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2015 CNY (¥)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)
Short-term deposits
Short-term deposits	¥ 1,894,946	$ 292,529	¥ 4,214,576
RMB [Member]
Short-term deposits
Short-term deposits	250,000		1,921,520
US$ [Member]
Short-term deposits
Short-term deposits	¥ 1,644,946	$ 253,322	¥ 2,293,056	$ 374,685

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- Definition

Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1
-Subparagraph g
-Article 7

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