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Financial Risk Management Objectives - Summary of Balance of Financial Assets and Liabilities Denominated in a Currency Different from the Company's Reporting Currency (Detail)
฿ in Thousands, ¥ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands
Dec. 31, 2017
USD ($)
Dec. 31, 2017
THB (฿)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
SGD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
HKD ($)
Dec. 31, 2017
AUD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
THB (฿)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
SGD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2016
HKD ($)
Dec. 31, 2016
AUD ($)
Dec. 31, 2016
JPY (¥)
Aug. 13, 2014
USD ($)
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                                
Financial assets denominated in a currency different $ 184,106,000             $ 160,455,000                
Financial liabilities denominated in a currency different $ 77,560,000             $ 62,964,000               $ 0
Foreign currency risk [Member] | Thai Baht (THB) [Member]                                
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                                
Financial assets denominated in a currency different | ฿   ฿ 354             ฿ 354              
Financial liabilities denominated in a currency different | ฿   ฿ 30             ฿ 30              
Foreign currency risk [Member] | Singapore dollars (SGD) [Member]                                
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                                
Financial assets denominated in a currency different       $ 39             $ 127          
Financial liabilities denominated in a currency different       $ 58             $ 23          
Foreign currency risk [Member] | Taiwan dollar (TWD) [Member]                                
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                                
Financial assets denominated in a currency different         $ 5,927             $ 1,602        
Financial liabilities denominated in a currency different         $ 1,705             $ 2,201        
Foreign currency risk [Member] | Renminbi (RMB) [Member]                                
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                                
Financial assets denominated in a currency different | ¥     ¥ 115,545             ¥ 88,477            
Financial liabilities denominated in a currency different | ¥     ¥ 21,961             ¥ 12,965            
Foreign currency risk [Member] | Hong Kong, dollar (HKD) [Member]                                
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                                
Financial assets denominated in a currency different           $ 31,578             $ 19,840      
Financial liabilities denominated in a currency different           $ 42             $ 63      
Foreign currency risk [Member] | Australian dollar (AUD) [Member]                                
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                                
Financial assets denominated in a currency different             $ 766             $ 919    
Foreign currency risk [Member] | Japanese yen (JPY) [Member]                                
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                                
Financial liabilities denominated in a currency different | ¥                             ¥ 14,978