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LOANS AND BORROWINGS - Particulars of secured long-term loans and borrowings (Details)
¥ in Thousands, $ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
subsidiary
Sep. 30, 2017
USD ($)
subsidiary
Dec. 31, 2009
CNY (¥)
Sep. 30, 2017
CNY (¥)
subsidiary
Jun. 30, 2017
CNY (¥)
Mar. 31, 2017
USD ($)
subsidiary
Dec. 31, 2016
CNY (¥)
Sep. 30, 2016
CNY (¥)
subsidiary
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Secured long-term loans and borrowings                    
Secured long-term loans and borrowings       ¥ 2,873,077     ¥ 1,898,377      
Outstanding short-term borrowings       314,052     239,777      
Long-term loans guaranteed by William Wei Huang, Director and CEO of the Company       0     9,500      
Subsidiary A | Entrusted credit facility with the local government                    
Secured long-term loans and borrowings                    
Term of loan     13 years              
Principal amount of credit facility     ¥ 322,000              
Outstanding loan under credit facility       ¥ 167,279            
Effective interest rate (as a percent) 4.90% 4.90%   4.90%            
Subsidiary A | Entrusted credit facility with the local government | Prepaid land use rights, net                    
Secured long-term loans and borrowings                    
Assets pledged       ¥ 6,126            
Subsidiary B | Credit facility with a third party bank                    
Secured long-term loans and borrowings                    
Principal amount of credit facility                   ¥ 200,000
Subsidiary C | Loan facilities with third party banks                    
Secured long-term loans and borrowings                    
Principal amount of credit facility                 ¥ 120,000  
Two Subsidiaries, B | Loan facilities with third party banks                    
Secured long-term loans and borrowings                    
Number of subsidiaries entered into loan facilities | subsidiary               2    
Principal amount of credit facility               ¥ 1,135,000    
Outstanding loan under credit facility       998,323            
Early repayment if STT Communications Ltd. ceases to directly or indirectly own, the percentage of equity interests of STT GDC Pte. Ltd.               50.10%    
Early repayment if STT GDC PTe. Ltd. ceases to own and control, the percentage of equity interest in the Company prior to an initial public offering (IPO)               40.00%    
Early repayment if STT GDC PTe. Ltd. ceases to own and control, the percentage of equity interest in the Company after an initial public offering (IPO)               30.00%    
Early repayment if cease to own and control percentage of the equity interest in the borrowing subsidiaries               100.00%    
Amount to be early repaid               ¥ 50,000    
Two Subsidiaries, B | Loan facilities with third party banks | William Wei Huang, Director and CEO of the Company                    
Secured long-term loans and borrowings                    
Early repayment if cease to own and control percentage of the equity interest in GDS Beijing               99.90%    
Two Subsidiaries, B | Loan facilities with third party banks | Accounts receivable                    
Secured long-term loans and borrowings                    
Assets pledged       51,850            
Two Subsidiaries, B | Loan facilities with third party banks | Property and equipment, net                    
Secured long-term loans and borrowings                    
Assets pledged       100,721            
Two Subsidiaries, B | Short term working capital loan                    
Secured long-term loans and borrowings                    
Outstanding short-term borrowings       ¥ 41,871            
Effective interest rate (as a percent) 5.66% 5.66%   5.66%            
Two Subsidiaries, B | Long term loans                    
Secured long-term loans and borrowings                    
Outstanding loan under credit facility       ¥ 956,452            
Two Subsidiaries, B | Long term loans | Minimum                    
Secured long-term loans and borrowings                    
Effective interest rate (as a percent) 7.02% 7.02%   7.02%            
Two Subsidiaries, B | Long term loans | Maximum                    
Secured long-term loans and borrowings                    
Effective interest rate (as a percent) 7.25% 7.25%   7.25%            
Two Subsidiaries, I | Loan facilities with third party banks                    
Secured long-term loans and borrowings                    
Number of subsidiaries entered into loan facilities | subsidiary           2        
Principal amount of credit facility | $           $ 45,000        
Outstanding loan under credit facility       ¥ 298,693            
Effective interest rate (as a percent)           5.41%        
Two Subsidiaries, H | Facility agreement with a third party bank                    
Secured long-term loans and borrowings                    
Term of loan 5 years                  
Number of subsidiaries entered into loan facilities | subsidiary 2 2   2            
Principal amount of credit facility       ¥ 570,000            
Amount to be early repaid       50,000            
Two Subsidiaries, H | Facility agreement with a third party bank | People's Bank Of China ("PBOC") Base Rate                    
Secured long-term loans and borrowings                    
Interest rate spread   130.00%                
Two Subsidiaries, H | Facility Agreement with third party bank sub facility one                    
Secured long-term loans and borrowings                    
Principal amount of credit facility       200,000            
Two Subsidiaries, H | Facility Agreement with third party bank sub facility one | Minimum                    
Secured long-term loans and borrowings                    
Term of loan   3 years                
Two Subsidiaries, H | Facility Agreement with third party bank sub facility one | Maximum                    
Secured long-term loans and borrowings                    
Term of loan   5 years                
Two Subsidiaries, H | Facility Agreement with third party bank sub facility one | People's Bank Of China ("PBOC") Base Rate                    
Secured long-term loans and borrowings                    
People's Bank of China Base Rate (as a percent)   4.75%                
Two Subsidiaries, H | Facility Agreement with third party bank sub facility two                    
Secured long-term loans and borrowings                    
Principal amount of credit facility       370,000            
People's Bank of China Base Rate (as a percent)   6.30%                
Subsidiary D | Loan facilities with third party banks                    
Secured long-term loans and borrowings                    
Principal amount of credit facility             ¥ 530,000   ¥ 430,000  
Outstanding loan under credit facility       ¥ 267,940            
Effective interest rate (as a percent) 7.84% 7.84%   7.84%            
Early repayment if Singapore Technologies Telemedia Limited of Singapore ceases to own and control, the percentage of equity interest in the Company prior to an initial public offering (IPO)             40.00%      
Early repayment if Singapore Technologies Telemedia Limited of Singapore ceases to own and control, the percentage of equity interest in the Company after an initial public offering (IPO)             30.00%      
Early repayment if cease to own and control percentage of the equity interest in the borrowing subsidiaries             100.00%      
Amount to be early repaid             ¥ 30,000      
Subsidiary D | Loan facilities with third party banks | William Wei Huang, Director and CEO of the Company                    
Secured long-term loans and borrowings                    
Early repayment if cease to own and control percentage of the equity interest in GDS Beijing             99.96%      
Subsidiary D | Loan facilities with third party banks | Accounts receivable                    
Secured long-term loans and borrowings                    
Assets pledged       ¥ 11,788            
Subsidiary D | Loan facilities with third party banks | Property and equipment, net                    
Secured long-term loans and borrowings                    
Assets pledged       91,094            
Subsidiary E | Long term loans                    
Secured long-term loans and borrowings                    
Outstanding loan under credit facility       188,848            
Subsidiary E | Facility agreement with a third party bank                    
Secured long-term loans and borrowings                    
Principal amount of credit facility               ¥ 220,000    
Amount to be early repaid               ¥ 50,000    
Subsidiary E | Facility agreement with a third party bank | Accounts receivable                    
Secured long-term loans and borrowings                    
Assets pledged       18,392            
Subsidiary E | Facility agreement with a third party bank | Property and equipment, net                    
Secured long-term loans and borrowings                    
Assets pledged       ¥ 79,557            
Subsidiary E | Long term loans                    
Secured long-term loans and borrowings                    
Effective interest rate (as a percent) 7.29% 7.29%   7.29%            
Subsidiary F | Facility agreement with a third party bank                    
Secured long-term loans and borrowings                    
Principal amount of credit facility             ¥ 380,000      
Outstanding loan under credit facility       ¥ 380,000            
Effective interest rate (as a percent) 8.01% 8.01%   8.01%            
Amount to be early repaid             30,000      
Subsidiary F | Facility agreement with a third party bank | Accounts receivable                    
Secured long-term loans and borrowings                    
Assets pledged       ¥ 19,727            
Subsidiary F | Facility agreement with a third party bank | Property and equipment, net                    
Secured long-term loans and borrowings                    
Assets pledged       124,799            
Subsidiary G | Facility agreement with a third party bank                    
Secured long-term loans and borrowings                    
Principal amount of credit facility             310,000      
Outstanding loan under credit facility       246,668            
Amount to be early repaid             ¥ 50,000      
Subsidiary G | Facility agreement with a third party bank | Accounts receivable                    
Secured long-term loans and borrowings                    
Assets pledged       3,217            
Subsidiary G | Facility agreement with a third party bank | Property and equipment, net                    
Secured long-term loans and borrowings                    
Assets pledged       157,282            
Subsidiary G | Facility agreement with a third party bank | Prepaid land use rights, net                    
Secured long-term loans and borrowings                    
Assets pledged       14,020            
Subsidiary G | Short term working capital loan                    
Secured long-term loans and borrowings                    
Outstanding loan under credit facility       ¥ 5,985            
Effective interest rate (as a percent) 5.66% 5.66%   5.66%            
Subsidiary G | Long term loans                    
Secured long-term loans and borrowings                    
Outstanding loan under credit facility       ¥ 240,683            
Effective interest rate (as a percent) 7.04% 7.04%   7.04%            
Subsidiary H | Short term working capital loan                    
Secured long-term loans and borrowings                    
Outstanding loan under credit facility       ¥ 10,196            
Effective interest rate (as a percent) 6.30% 6.30%   6.30%            
Subsidiary H | Long term loans                    
Secured long-term loans and borrowings                    
Outstanding loan under credit facility       ¥ 373,182            
Effective interest rate (as a percent) 7.32% 7.32%   7.32%            
Subsidiary H | Project loan facility agreement with a third party bank                    
Secured long-term loans and borrowings                    
Principal amount of credit facility         ¥ 644,000          
Outstanding loan under credit facility       ¥ 383,378            
Amount to be early repaid       ¥ 50,000            
Subsidiary H | Project loan facility agreement with a third party bank | Accounts receivable                    
Secured long-term loans and borrowings                    
Assets pledged | $ $ 22,572 $ 22,572                
Subsidiary H | Project loan facility agreement with a third party bank | Property and equipment, net                    
Secured long-term loans and borrowings                    
Assets pledged | $ $ 95,999 $ 95,999