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PROPERTY AND EQUIPMENT, NET - Acquired under capital leases (Details) - CNY (¥)
¥ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Capital lease assets    
Capital leases assets, gross ¥ 1,977,253 ¥ 1,312,454
Less: Accumulated depreciation (114,827) (64,151)
Capital leases assets, net 1,862,426 1,248,303
Buildings    
Capital lease assets    
Capital leases assets, gross 1,964,535 1,286,079
Asset under construction    
Capital lease assets    
Capital leases assets, gross 419,177 313,721
Data center equipment    
Capital lease assets    
Capital leases assets, gross ¥ 12,718 ¥ 26,375