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Cash and cash equivalents (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2015
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
CNY (¥)
Dec. 31, 2012
CNY (¥)
Cash and cash equivalents [Line Items]            
Cash and cash equivalents ¥ 928,934 $ 143,403 ¥ 475,028 $ 73,331 ¥ 729,598 ¥ 504,702
RMB [Member]            
Cash and cash equivalents [Line Items]            
Cash and cash equivalents 450,802   394,214      
US$ [Member]            
Cash and cash equivalents [Line Items]            
Cash and cash equivalents ¥ 478,132 $ 73,632 ¥ 80,814 $ 13,205