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GOODWILL (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Changes in the carrying amount of goodwill by segment      
Balance at the beginning of the period ¥ 73,166    
Balance at the end of the period ¥ 73,166 $ 10,642 ¥ 73,166
Measurement Input, Long-term Revenue Growth Rate [Member]      
Changes in the carrying amount of goodwill by segment      
Terminal growth rate (as a percent) 3.00% 3.00%  
Minimum [Member] | Measurement Input, Default Rate [Member]      
Changes in the carrying amount of goodwill by segment      
Discount rate (as a percent) 14.80% 14.80%  
Maximum [Member] | Measurement Input, Default Rate [Member]      
Changes in the carrying amount of goodwill by segment      
Discount rate (as a percent) 17.00% 17.00%  
Better Schools [Member]      
Changes in the carrying amount of goodwill by segment      
Balance at the beginning of the period     33,482
Balance at the end of the period ¥ 33,482    
Better Schools [Member] | Tutoring [Member]      
Changes in the carrying amount of goodwill by segment      
Balance at the beginning of the period     7,772
Balance at the end of the period 7,772    
Better Schools [Member] | K-12 Schools [Member]      
Changes in the carrying amount of goodwill by segment      
Balance at the beginning of the period     25,710
Balance at the end of the period 25,710    
Better Jobs [Member]      
Changes in the carrying amount of goodwill by segment      
Balance at the beginning of the period     73,166
Balance at the end of the period 73,166    
Better Jobs [Member] | Career Enhancement [Member]      
Changes in the carrying amount of goodwill by segment      
Balance at the beginning of the period     ¥ 39,684
Balance at the end of the period ¥ 39,684