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Business Combinations - Summary of Net Cash Outflow on Acquisition of Subsidiary SPIL (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of detailed information about business combination [Line Items]        
Less: Cash and cash equivalent acquired     $ 29,133  
Net cash outflow on acquisition of subsidiaries     $ (7,046,464)  
Siliconware Precision Industries Co., Ltd. [member]        
Disclosure of detailed information about business combination [Line Items]        
Total consideration $ 5,502,796     $ 168,440,585
Less: Payable for consideration representing the ordinary shares originally held by ASE (1,735,046) $ (53,109,760)    
Less: Cash and cash equivalent acquired (656,288) (20,088,970)    
Net cash outflow on acquisition of subsidiaries $ 3,111,462 $ 95,241,855