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PROPERTY, PLANT AND EQUIPMENT, NET (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2025
USD ($)
Property, plant and equipment, net          
Total ¥ 5,782,034   ¥ 5,949,633    
Less: accumulated depreciation (3,693,138)   (3,530,150)    
Less: accumulated impairment (19,272)   (19,272)    
Net book value 2,069,624   2,400,211   $ 295,952
Depreciation expense 934,119 $ 133,577 743,728 ¥ 775,042  
Office building          
Property, plant and equipment, net          
Total 697,455   697,136    
Vehicles          
Property, plant and equipment, net          
Total 21,320   23,939    
Computer equipment          
Property, plant and equipment, net          
Total 1,247,976   1,179,606    
Furniture and office equipment          
Property, plant and equipment, net          
Total 410,740   395,828    
Leasehold improvement          
Property, plant and equipment, net          
Total 3,220,054   3,477,118    
Construction in progress          
Property, plant and equipment, net          
Total ¥ 184,489   ¥ 176,006