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Borrowings - Summary of Bank Loans (Parenthetical) (Detail)
Dec. 31, 2020
Dec. 31, 2019
Syndicated bank loans [Member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates   1.80%
Syndicated bank loans [Member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 1.15%  
Syndicated bank loans [Member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 1.17%  
Other loans [Member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 0.56% 0.82%
Other loans [Member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 4.15% 4.13%
Mortgage loans [Member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 1.90% 2.43%
Mortgage loans [Member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 4.90% 4.90%