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Borrowings - Summary of Long-term Bills Payable (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
China Bills Finance Corporation [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 0.96%  
Borrowings maturity February 2019  
International Bills Finance Corporation [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 0.96%  
Borrowings maturity March 2019  
Ta Ching Bills Finance Corporation [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates   1.00%
Borrowings maturity   December 2017