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PRINCIPAL ACCOUNTING POLICIES - Goodwill and Intangible Assets, Impairment of Long-Lived Assets Other Than Goodwill (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Principal accounting policies      
Impairment of goodwill ¥ 0 ¥ 0 ¥ 0
Impairment of intangible assets 0 0 0
Impairment of long-lived assets recognized ¥ 0 ¥ 0 ¥ 0
Customer relationships      
Principal accounting policies      
Estimated useful lives 5 years    
Acquired training licenses      
Principal accounting policies      
Estimated useful lives 6 years    
Minimum | Computer software      
Principal accounting policies      
Estimated useful lives 2 years    
Minimum | Technology      
Principal accounting policies      
Estimated useful lives 5 years    
Minimum | Trade names      
Principal accounting policies      
Estimated useful lives 10 years    
Minimum | Acquired training and other licenses      
Principal accounting policies      
Estimated useful lives 5 years    
Maximum | Computer software      
Principal accounting policies      
Estimated useful lives 10 years    
Maximum | Technology      
Principal accounting policies      
Estimated useful lives 10 years    
Maximum | Trade names      
Principal accounting policies      
Estimated useful lives 20 years    
Maximum | Acquired training and other licenses      
Principal accounting policies      
Estimated useful lives 10 years