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DEPOSITS FOR NON-CURRENT ASSETS - Additional Information (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2019
CNY (¥)
Valuation and Qualifying Accounts Disclosure [Line Items]          
Assets, Noncurrent ¥ 5,645,476   ¥ 4,658,540 $ 885,898  
Capital Addition Purchase Commitments [Member]          
Valuation and Qualifying Accounts Disclosure [Line Items]          
Commitments to purchase certain medical equipment 257,165   480,290 $ 40,355  
Impairment loss on deposit assets 0   8,500   ¥ 62,400
Write off for gross amount of deposits and allowance 8,500 $ 1,334 93,260    
Assets, Noncurrent 0   0    
Debt Instrument, Face Amount ¥ 0   ¥ 0