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Borrowings - Summary of Bills Payable (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
China Bills Finance Corporation [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates   0.99%
Borrowings maturity February and March 2021  
China Bills Finance Corporation [member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 1.02%  
China Bills Finance Corporation [member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 1.05%  
International Bills Finance Corporation [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates   1.00%
Borrowings maturity March 2021  
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%  
Ta Ching Bills Finance Corporation [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates   0.98%
Borrowings maturity January 2021 to 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