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Property and equipment, net (Narrative) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Property and equipment, net [Abstract]        
Depreciation expense $ 52,069 ¥ 362,495 ¥ 150,991 ¥ 176,715