PROPERTY AND EQUIPMENT, NET - Carrying amounts of property and equipment held under capital leases (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Property and equipment held under finance leases, gross	¥ 1,780,071	¥ 2,102,896
Less: Accumulated depreciation	(709,209)	(847,449)
Property and equipment held under finance leases net excluding construction in progress	1,070,862	1,255,447
Construction-in-progress	219,283
Impairment	(19,361)	(18,808)
Property and equipment held under finance leases, net	¥ 1,270,784	¥ 1,236,639
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, Plant and Equipment, Net	Property, Plant and Equipment, Net
Property
Lessee, Lease, Description [Line Items]
Property and equipment held under finance leases, gross	¥ 993,158	¥ 993,158
Computer and network equipment
Lessee, Lease, Description [Line Items]
Property and equipment held under finance leases, gross	648,989	971,814
Optical fibers
Lessee, Lease, Description [Line Items]
Property and equipment held under finance leases, gross	¥ 137,924	¥ 137,924

Amount, after accumulated amortization, of right-of-use asset from finance lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of accumulated amortization of right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Subparagraph (a)
-SubTopic 20
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-SubTopic 20
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-4

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before accumulated amortization, of right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-SubTopic 20
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Indicates line item in statement of financial position that includes finance lease right-of-use asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-2

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- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

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- Definition

Represents the amount of accumulated impairmrnt of right-of-use asset from finance lease.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Amount of construction-in-progress attributable to assets held under finance lease

+ References

No definition available.

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- Definition

Represents the amount of finance lease right-of-use assets net, excluding construction in progress.

+ References

No definition available.

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