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v3.21.1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition (Details) | 12 Months Ended
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Dec. 31, 2020
Maximum | Consulting services |
Revenue recognition |
Contract service period | 1 year

X
- Definition The contract service period over which the services are provided to customers for a fixed amount. + References No definition available. + Details
Name: | gds_ContractServicePeriod
Namespace Prefix: | gds_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=gds_ConsultingServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |