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Leases - Summary of detailed Information About Carrying Amounts of Right-of-use Assets Recognized and Movements During Year (Detail) - 12 months ended Dec. 31, 2019
¥ in Thousands
CNY (¥)
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]    
Addition ¥ 11,473 $ 1,619,000
Depreciation expenses (40,958) (5,781,000)
Disposal (1,771) (250,000)
Translation difference 32 5,000
Ending balance 415,384 58,628,000
Increase (decrease) due to changes in accounting policy [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 446,608 63,035
Effect of adopting of IFRS 16 446,608 $ 63,035,000
Building and office space [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Addition 11,473  
Depreciation expenses (26,597)  
Translation difference 36  
Ending balance 61,556  
Building and office space [member] | Increase (decrease) due to changes in accounting policy [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 76,644  
Effect of adopting of IFRS 16 76,644  
Office Furniture, Fittings and Equipment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation expenses (14)  
Translation difference (4)  
Ending balance 21  
Office Furniture, Fittings and Equipment [member] | Increase (decrease) due to changes in accounting policy [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 39  
Effect of adopting of IFRS 16 39  
Leasehold land [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation expenses (14,347)  
Disposal (1,771)  
Ending balance 353,807  
Leasehold land [member] | Increase (decrease) due to changes in accounting policy [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 369,925  
Effect of adopting of IFRS 16 ¥ 369,925