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Borrowings - Summary of Bills Payable (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Ta Ching Bills Finance Corporation [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 0.91%  
Borrowings maturity March 2022  
Ta Ching Bills Finance Corporation [member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates   1.01%
Ta Ching Bills Finance Corporation [member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates   1.03%
Mega Bills Finance Corporation [Member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates   1.04%
Borrowings maturity March 2022  
Mega Bills Finance Corporation [Member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 0.92%  
Mega Bills Finance Corporation [Member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 0.93%  
China Bills Finance Corporation [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings maturity March 2022 to December 2022  
China Bills Finance Corporation [member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 0.65% 1.02%
China Bills Finance Corporation [member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 0.90% 1.05%
International Bills Finance Corporation [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings maturity March 2020 to June 2020  
International Bills Finance Corporation [member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates   1.02%
International Bills Finance Corporation [member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates   1.05%