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Property, equipment and software, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Property, equipment and software, net          
Total property, equipment and software   ¥ 8,223,894     ¥ 11,122,704
Less: Accumulated depreciation   (1,990,788)     (3,725,675)
Net book value   6,233,106   $ 1,065,394 7,397,029
Depreciation expenses ¥ 1,944,606 1,123,076 ¥ 514,974    
Electronic equipment          
Property, equipment and software, net          
Total property, equipment and software   3,089,415     4,422,833
Office equipment          
Property, equipment and software, net          
Total property, equipment and software   202,422     266,411
Vehicles          
Property, equipment and software, net          
Total property, equipment and software   843,922     1,091,556
Logistic and warehouse equipment          
Property, equipment and software, net          
Total property, equipment and software   1,105,245     1,578,653
Leasehold improvement          
Property, equipment and software, net          
Total property, equipment and software   306,352     496,887
Software          
Property, equipment and software, net          
Total property, equipment and software   149,590     196,713
Building and building improvement          
Property, equipment and software, net          
Total property, equipment and software   ¥ 2,526,948     ¥ 3,069,651