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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition (Details)	12 Months Ended
	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: