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Other Financial Liabilities - Additional Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Jan. 01, 2019
Dec. 31, 2020
USD ($)
Dec. 31, 2020
SGD ($)
Jun. 24, 2020
USD ($)
Jun. 10, 2020
SGD ($)
Dec. 11, 2019
USD ($)
Jun. 01, 2018
SGD ($)
Disclosure of detailed information about borrowings [line items]              
Exchange rate           7.0901  
Forward contract [member]              
Disclosure of detailed information about borrowings [line items]              
Non-deliverable forward foreign exchange contract           $ 20.0  
DBS Bank Ltd [member]              
Disclosure of detailed information about borrowings [line items]              
Refinancing of uncommitted multi-currency revolving credit facility             $ 30.0
Credit facility maturity period   three          
Ownership interest in the entity, percentage   76.40%          
Facility limit     $ 30.0        
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     30.0        
Consolidated tangible net worth ratio   1.0 times          
DBS Bank Ltd [member] | Bottom of range [member]              
Disclosure of detailed information about borrowings [line items]              
Consolidated tangible net worth   $ 350.0          
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         $ 30.0    
Credit facility with MUFG Singapore Branch [member] | Top of range [member]              
Disclosure of detailed information about borrowings [line items]              
Credit facility with bank     30.0        
Consolidated tangible net worth   $ 120.0          
Consolidated tangible net worth ratio   2.0 times          
Facility limit     $ 30.0        
Sumitomo branch [Member]              
Disclosure of detailed information about borrowings [line items]              
Credit facility maturity period   6 months          
Refinancing of unsecured multi-currency revolving credit facility       $ 30.0      
Sumitomo branch [Member] | Top of range [member]              
Disclosure of detailed information about borrowings [line items]              
Credit facility with bank   $ 30.0          
Facility limit   30.0          
Sumitomo branch [Member] | Bottom of range [member]              
Disclosure of detailed information about borrowings [line items]              
Consolidated tangible net worth   $ 200.0          
Consolidated tangible net worth ratio   2.0 times