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Leases - Summary of detailed Information About Carrying Amounts of Right-of-use Assets Recognized and Movements During Year (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Beginning balance ¥ 415,384 $ 64,189 ¥ 446,608 $ 69,014
Addition 15,256 2,357 11,473 1,773
Depreciation expenses (43,298) (6,691) (40,958) (6,329)
Disposal (3,198) (494) (1,771) (274)
Translation difference (143) (22) 32 5
Ending balance 384,001 $ 59,339 415,384 $ 64,189
Leasehold land [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Beginning balance 353,807   369,925  
Addition 2,058      
Depreciation expenses (14,102)   (14,347)  
Disposal (3,198)   (1,771)  
Ending balance 338,565   353,807  
Building and office space [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Beginning balance 61,556   76,644  
Addition 13,198   11,473  
Depreciation expenses (29,182)   (26,597)  
Translation difference (142)   36  
Ending balance 45,430   61,556  
Office Furniture, Fittings and Equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Beginning balance 21   39  
Depreciation expenses (14)   (14)  
Translation difference (1)   (4)  
Ending balance ¥ 6   ¥ 21