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LOANS AND BORROWINGS - Type of short-term borrowings (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Short-term borrowings by type
Unsecured short-term loans and borrowings	¥ 221,436	¥ 80,000
Secured short-term loans and borrowings	1,009,320	317,213
Short-term borrowings	¥ 1,230,756	¥ 397,213

X

- 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

X

- 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

X

- 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

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120398452&loc=d3e534808-122878

+ Details

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