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PROPERTY AND EQUIPMENT, NET - Additional information (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2020	Dec. 31, 2019
PROPERTY AND EQUIPMENT, NET
Property and equipment, net	¥ 29,596,061	¥ 19,184,639
Payables for purchase of property and equipment due beyond one year	139,162	231,458
Asset Pledged as Collateral [Member]
PROPERTY AND EQUIPMENT, NET
Property and equipment, net	¥ 3,497,447	¥ 2,493,872

X

- Definition

Amount of payable for purchase of property, plant and equipment, due after one year or beyond the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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Namespace Prefix:	gds_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, after accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

+ Details

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Data Type:	xbrli:monetaryItemType
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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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: