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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Property and equipment, net (Details)	Dec. 31, 2024
Leasehold improvements
Property and equipment, net
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration]	us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember
Buildings | Minimum
Property and equipment, net
Property and equipment, estimated useful life	20 years
Buildings | Maximum
Property and equipment, net
Property and equipment, estimated useful life	40 years
Furniture, fixtures and equipment | Minimum
Property and equipment, net
Property and equipment, estimated useful life	1 year
Furniture, fixtures and equipment | Maximum
Property and equipment, net
Property and equipment, estimated useful life	20 years
Motor vehicles
Property and equipment, net
Property and equipment, estimated useful life	5 years

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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 7A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Definition

Indicates description of term of useful life for property, plant, and equipment when not stated as numeric value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482190/360-10-35-3

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