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Bonds Payable - Additional Information (Detail)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Jul. 31, 2015
USD ($)
Oct. 31, 2014
USD ($)
$ / shares
Oct. 31, 2014
TWD ($)
Jul. 31, 2014
USD ($)
Sep. 30, 2013
USD ($)
Dec. 31, 2017
TWD ($)
$ / shares
Dec. 31, 2018
USD ($)
Jul. 31, 2015
TWD ($)
$ / shares
Oct. 31, 2014
TWD ($)
$ / shares
Disclosure of detailed information about borrowings [line items]                    
Arising from equity component of convertible bonds             $ 214,022      
Siliconware Precision Industries Co., Ltd. [member]                    
Disclosure of detailed information about borrowings [line items]                    
Bonds maturity period     5 years 5 years            
Bonds face amount     $ 400,000              
Outstanding bond     148,000              
Total consideration     $ 170,434 $ 5,216,985            
Consideration per share | (per share)     $ 1.67             $ 51.20
Securities transactions tax     0.30% 0.30%            
Change in capital surplus     $ 12,692             $ 388,491
Unsecured overseas convertible bonds [member]                    
Disclosure of detailed information about borrowings [line items]                    
Bonds face amount           $ 400,000        
Bonds maturity period           5 years        
Unsecured overseas bonds conversion right exercised $ 399,600                  
Early redeemed the outstanding Bonds $ 400                  
Unsecured overseas convertible bonds [member] | Bottom of range [member]                    
Disclosure of detailed information about borrowings [line items]                    
Unsecured overseas bonds conversion price | $ / shares             $ 27.95      
Unsecured overseas convertible bonds [member] | Top of range [member]                    
Disclosure of detailed information about borrowings [line items]                    
Unsecured overseas bonds conversion price | $ / shares             $ 28.96      
US$200,000 thousand [member]                    
Disclosure of detailed information about borrowings [line items]                    
Bonds face amount   $ 200,000           $ 200,000    
Bonds maturity period   2 years 9 months                
Unsecured overseas bonds fixed exchange rate | $ / shares                 $ 30.928  
Arising from equity component of convertible bonds                 $ 214,022  
Secured Overseas Bonds One [member]                    
Disclosure of detailed information about borrowings [line items]                    
Bonds face amount         $ 300,000          
Bonds maturity period         3 years          
Percentage of ownership interest in subsidiary         100.00%          
Annual interest rates of bonds         2.125%