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PREPAID LAND USE RIGHTS (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Prepaid land use rights	¥ 736,695	¥ 782,319
Less: Accumulated amortization	(58,505)	(35,132)
Prepaid land use rights, net	678,190	747,187
Amortization of prepaid land use rights	26,656	26,393	¥ 6,082
Asset Pledged as Collateral [Member]
Prepaid land use rights, net	¥ 678,190	¥ 741,032

X

- Definition

Amortization expense of prepaid land use rights.

+ References

No definition available.

+ Details

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

X

- Definition

Accumulated amortization of long-term prepaid land use rights.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of prepaid land use rights as of balance sheet date that are expected to be consumed after one year or beyond the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of prepaid land use rights which are expected to be consumed after one year or beyond the normal operating cycle before amortization expense if any.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_PledgedStatusAxis=us-gaap_AssetPledgedAsCollateralMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: