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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 |  |  |  |  |  |  |  |

X
- Definition The minimum amount of any financial indebtedness the Company fails to repay when due or within any originally applicable grace period, which would trigger the cross default provision in the loan facilities. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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