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Financial Assets and Financial Liabilities - Summary of Interest-bearing Loans and Borrowings (Detail)
฿ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
THB (฿)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
THB (฿)
Dec. 31, 2017
SGD ($)
Disclosure of detailed information about borrowings [Line Items]              
Current interest-bearing loans and borrowings, Amount $ 24,814 $ 41,151          
United States of America, Dollars (USD) [Member]              
Disclosure of detailed information about borrowings [Line Items]              
Current interest-bearing loans and borrowings, Maturity   Feb. 2018          
Current interest-bearing loans and borrowings, Amount   $ 3,800          
United States of America, Dollars (USD) [Member] | Bottom of range [Member]              
Disclosure of detailed information about borrowings [Line Items]              
Current interest-bearing loans and borrowings, Interest rate   3.20%     3.20% 3.20% 3.20%
United States of America, Dollars (USD) [Member] | Top of range [Member]              
Disclosure of detailed information about borrowings [Line Items]              
Current interest-bearing loans and borrowings, Interest rate   3.50%     3.50% 3.50% 3.50%
Renminbi (RMB) [Member]              
Disclosure of detailed information about borrowings [Line Items]              
Current interest-bearing loans and borrowings, Maturity Jan. 2019 ~ Sept. 2019 Apr. 2018 ~ Sept. 2018          
Current interest-bearing loans and borrowings, Amount $ 6,130 $ 4,602 ¥ 42,100   ¥ 30,000    
Renminbi (RMB) [Member] | Bottom of range [Member]              
Disclosure of detailed information about borrowings [Line Items]              
Current interest-bearing loans and borrowings, Interest rate 4.70% 4.70% 4.70% 4.70% 4.70% 4.70% 4.70%
Renminbi (RMB) [Member] | Top of range [Member]              
Disclosure of detailed information about borrowings [Line Items]              
Current interest-bearing loans and borrowings, Interest rate 4.79% 5.22% 4.79% 4.79% 5.22% 5.22% 5.22%
Thai Baht (THB) [Member]              
Disclosure of detailed information about borrowings [Line Items]              
Current interest-bearing loans and borrowings, Maturity Jan. 2019 ~ Jun. 2019 Jan. 2018 ~ Jun. 2018          
Current interest-bearing loans and borrowings, Amount $ 18,684 $ 32,649   ฿ 602,150   ฿ 1,058,995  
Thai Baht (THB) [Member] | Bottom of range [Member]              
Disclosure of detailed information about borrowings [Line Items]              
Current interest-bearing loans and borrowings, Interest rate 1.10% 1.70% 1.10% 1.10% 1.70% 1.70% 1.70%
Thai Baht (THB) [Member] | Top of range [Member]              
Disclosure of detailed information about borrowings [Line Items]              
Current interest-bearing loans and borrowings, Interest rate 2.10% 2.60% 2.10% 2.10% 2.60% 2.60% 2.60%
Singapore dollars (SGD) [Member]              
Disclosure of detailed information about borrowings [Line Items]              
Current interest-bearing loans and borrowings, Maturity   Feb. 2018          
Current interest-bearing loans and borrowings, Amount   $ 100         $ 134
Singapore dollars (SGD) [Member] | Bottom of range [Member]              
Disclosure of detailed information about borrowings [Line Items]              
Current interest-bearing loans and borrowings, Interest rate   2.47%     2.47% 2.47% 2.47%
Singapore dollars (SGD) [Member] | Top of range [Member]              
Disclosure of detailed information about borrowings [Line Items]              
Current interest-bearing loans and borrowings, Interest rate   2.54%     2.54% 2.54% 2.54%