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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Property and equipment, net (Details)
12 Months Ended
Dec. 31, 2021
Leasehold improvements  
Property and equipment, net  
Property and equipment, estimated useful life Shorter of the lease term or their estimated useful lives
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