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LOANS AND BORROWINGS - Long-term borrowings secured (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans and Borrowings
Assets to secure long-term loans and borrowings	¥ 4,939,011	¥ 3,743,751
Weighted average interest rates of long-term borrowings	6.73%	7.40%
Accounts receivable
Loans and Borrowings
Assets to secure long-term loans and borrowings	¥ 743,031	¥ 508,847
Property and equipment, net
Loans and Borrowings
Assets to secure long-term loans and borrowings	2,918,670	2,493,872
Prepaid land use rights, net
Loans and Borrowings
Assets to secure long-term loans and borrowings	678,190	¥ 741,032
Operating lease ROU assets
Loans and Borrowings
Assets to secure long-term loans and borrowings	¥ 599,120

X

- Definition

Amount of assets pledged to secure a long-term debt instrument.

+ References

No definition available.

+ Details

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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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: