Deferred revenue (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)
Deferred revenue [Line Items]
Deferred revenue, current	$ 59,480	¥ 385,300	¥ 356,150
Deferred revenue, non-current	$ 3,204	20,752	24,383
IVAS revenues [Member]
Deferred revenue [Line Items]
Deferred revenue, current		361,023	331,555
Deferred revenue, non-current		20,085	23,850
Education revenues [Member]
Deferred revenue [Line Items]
Deferred revenue, current		21,577	22,899
Government grants [Member]
Deferred revenue [Line Items]
Deferred revenue, current		2,700	1,696
Deferred revenue, non-current		¥ 667	¥ 533

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a).Q1)
-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 13
-Section A

Name:	us-gaap_DeferredRevenueNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant