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Borrowings - Summary of Bank Loans (Parenthetical) (Detail)
Dec. 31, 2019
Dec. 31, 2018
Syndicated bank loans [Member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 1.80% 1.80%
Other loans [Member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 0.82% 0.75%
Other loans [Member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 4.13% 3.77%
Mortgage loans [Member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates   5.39%
Mortgage loans [Member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 2.43%  
Mortgage loans [Member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 4.90%