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LOANS AND BORROWINGS - Short-term borrowings secured (Details) - CNY (¥) ¥ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Short-term borrowings
Weighted average interest rates of short-term borrowings	5.39%		5.36%
Accounts receivable
Short-term borrowings
Assets to secure short-term loans and borrowings	¥ 12,998	¥ 19,914

X

- Definition

Amount of assets pledged to secure a short-term debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	gds_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

Name:	us-gaap_ShortTermDebtLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average interest rate of short-term debt outstanding calculated at point in time.

+ 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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: