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LEASES - Lease and other financing obligations secured by assets (Details) ¥ in Thousands	Dec. 31, 2020 CNY (¥)
Lessee, Lease, Description [Line Items]
Assets to secure lease and other financing obligations	¥ 707,130
Accounts receivable
Lessee, Lease, Description [Line Items]
Assets to secure lease and other financing obligations	128,353
Property and equipment, net
Lessee, Lease, Description [Line Items]
Assets to secure lease and other financing obligations	¥ 578,777

X

- Definition

Amount of assets to secure lease and other financing obligations.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_AccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_PropertyPlantAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: