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LOANS AND BORROWINGS - Short-term borrowings (Details) - CNY (¥) ¥ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Short-term borrowings |  |
Unsecured short-term loans and borrowings | ¥ 50,000 |
Secured short-term loans and borrowings | 264,052 | ¥ 239,777
Short-term borrowings | ¥ 314,052 | ¥ 239,777

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- Definition Carrying value as of the balance sheet date of the collateralized debt obligations due within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | gds_SecuredShortTermDebt
Namespace Prefix: | gds_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This concept does not have any references. + References No definition available. + Details
Name: | gds_ShortTermDebtByTypeUnsecuredAndSecuredAbstract
Namespace Prefix: | gds_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition carrying amount as of the balance sheet date of the uncollateralized debt obligations due within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | gds_UnsecuredShortTermDebt
Namespace Prefix: | gds_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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
Name: | us-gaap_ShortTermBorrowings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant