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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
Name: | gds_PrepaidLandUseRightsAccumulatedAmortization
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: |