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Property, equipment and software, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Property, equipment and software, net          
Total property, equipment and software   ¥ 3,433,750     ¥ 8,223,894
Less: Accumulated depreciation   (1,025,312)     (1,990,788)
Net book value   2,408,438   $ 962,226 6,233,106
Depreciation expenses ¥ 1,123,076 514,974 ¥ 257,213    
Electronic equipment          
Property, equipment and software, net          
Total property, equipment and software   1,372,896     3,089,415
Office equipment          
Property, equipment and software, net          
Total property, equipment and software   33,190     202,422
Vehicles          
Property, equipment and software, net          
Total property, equipment and software   530,731     843,922
Logistic and warehouse equipment          
Property, equipment and software, net          
Total property, equipment and software   598,831     1,105,245
Leasehold improvement          
Property, equipment and software, net          
Total property, equipment and software   136,522     306,352
Software          
Property, equipment and software, net          
Total property, equipment and software   100,215     149,590
Building and building improvement          
Property, equipment and software, net          
Total property, equipment and software   ¥ 661,365     ¥ 2,526,948