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Land use right, net (Narrative) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Amortization of acquired intangible assets and land use right ¥ 100,892 $ 14,531 ¥ 64,201 ¥ 12,598
Land use right [Member]        
Amortization of acquired intangible assets and land use right ¥ 43,915