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Business Combinations - Summary of Net Cash Outflow (Inflow) on Acquisition of Subsidiary (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about business combination [Line Items]        
Less: Cash and cash equivalent acquired     $ 29,133  
Net cash outflow (inflow) on acquisition of subsidiaries     $ 7,046,464  
Siliconware Precision Industries Co., Ltd. [member]        
Disclosure of detailed information about business combination [Line Items]        
Total consideration $ 168,440,585      
Less: Payable for consideration representing the ordinary shares originally held by ASE (53,109,760)      
Less: Cash and cash equivalent acquired (20,088,970)      
Net cash outflow (inflow) on acquisition of subsidiaries 95,241,855      
Advanced Microelectronic Products Inc. [member]        
Disclosure of detailed information about business combination [Line Items]        
Total consideration 250,000     $ 8,358
Less: Cash and cash equivalent acquired (349,496) $ (11,685)    
Net cash outflow (inflow) on acquisition of subsidiaries (99,496) (3,327)    
ASE Embedded Electronics Inc. [member]        
Disclosure of detailed information about business combination [Line Items]        
Total consideration 0     0
Less: Cash and cash equivalent acquired (23,197) (775)    
Net cash outflow (inflow) on acquisition of subsidiaries (23,197) (775)    
UGPL [Member]        
Disclosure of detailed information about business combination [Line Items]        
Total consideration 313,057     $ 10,467
Less: Cash and cash equivalent acquired (108,718) (3,635)    
Net cash outflow (inflow) on acquisition of subsidiaries $ 204,339 $ 6,832