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Other Financial Liabilities - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2018
SGD ($)
Dec. 31, 2018
USD ($)
Jun. 01, 2018
SGD ($)
Mar. 31, 2017
USD ($)
Mar. 30, 2017
SGD ($)
DBS Bank Ltd [member]          
Disclosure of detailed information about borrowings [line items]          
Refinancing of uncommitted multi-currency revolving credit facility     $ 30,000,000    
Credit facility maturity period Three years        
Ownership interest in the entity, percentage 76.40%        
DBS Bank Ltd [member] | Hong Leong Asia Limited [member]          
Disclosure of detailed information about borrowings [line items]          
Ownership interest in the entity, percentage 35.00%        
DBS Bank Ltd [member] | Top of range [member]          
Disclosure of detailed information about borrowings [line items]          
Credit facility with bank $ 30,000,000        
Consolidated tangible net worth ratio 100.00% 100.00%      
DBS Bank Ltd [member] | Bottom of range [member]          
Disclosure of detailed information about borrowings [line items]          
Consolidated tangible net worth   $ 350,000,000      
Credit facility with MUFG Singapore Branch [member]          
Disclosure of detailed information about borrowings [line items]          
Credit facility maturity period Three years        
Refinancing of unsecured multi-currency revolving credit facility         $ 30,000,000
Credit facility with MUFG Singapore Branch [member] | Top of range [member]          
Disclosure of detailed information about borrowings [line items]          
Consolidated tangible net worth ratio 200.00% 200.00%      
Facility limit $ 30,000,000        
Credit facility with MUFG Singapore Branch [member] | Bottom of range [member]          
Disclosure of detailed information about borrowings [line items]          
Consolidated tangible net worth   $ 120,000,000      
Sumitomo branch [Member]          
Disclosure of detailed information about borrowings [line items]          
Credit facility maturity period Three years        
Refinancing of uncommitted and unsecured multi-currency revolving credit facility       $ 30,000,000  
Sumitomo branch [Member] | Top of range [member]          
Disclosure of detailed information about borrowings [line items]          
Consolidated tangible net worth ratio 200.00% 200.00%      
Facility limit   $ 30,000,000      
Sumitomo branch [Member] | Bottom of range [member]          
Disclosure of detailed information about borrowings [line items]          
Consolidated tangible net worth   $ 200,000,000