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Principal accounting policies (Convenience Translation - Narrative) (Details)
¥ in Thousands
12 Months Ended
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Convenience translation      
Rate of translations of amounts from RMB into US$ 6.4778    
Impairment of long-lived assets      
Impairment charges of intangible assets ¥ 57,199 ¥ 5,697