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Other Financial Liabilities - Summary of Interest-bearing Loans and Borrowings (Parenthetical) (Detail) - Singapore Dollar [Member]
Dec. 31, 2017
SGD ($)
Dec. 31, 2016
SGD ($)
Dec. 31, 2016
USD ($)
Bank of Tokyo-Mitsubishi, UFJ Ltd [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Facility limit $ 30,000,000 $ 30,000,000  
Sumitomo Mitsui Banking Corporation [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Facility limit     $ 30,000,000