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Business Combinations - Summary of Impact of Acquisitions by Comprehensive Income (Detail)
$ in Thousands, $ in Thousands
2 Months Ended 8 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Disclosure of detailed information about business combination [Line Items]              
Net Profit (loss) $ (11,995) $ (401)     $ (469,598) $ (15,700)  
Increase (decrease) due to changes in accounting policy [member]              
Disclosure of detailed information about business combination [Line Items]              
Operating revenue $ 39,080 $ 1,307     $ (1,159) $ (39)  
Siliconware Precision Industries Co., Ltd. [member]              
Disclosure of detailed information about business combination [Line Items]              
Net Profit (loss)             $ 7,629,382
Siliconware Precision Industries Co., Ltd. [member] | Increase (decrease) due to changes in accounting policy [member]              
Disclosure of detailed information about business combination [Line Items]              
Operating revenue             61,247,727
Advanced Microelectronic Products Inc. [member]              
Disclosure of detailed information about business combination [Line Items]              
Net Profit (loss)     $ (217,163) $ (7,261)      
Advanced Microelectronic Products Inc. [member] | Increase (decrease) due to changes in accounting policy [member]              
Disclosure of detailed information about business combination [Line Items]              
Operating revenue       $ 23,545     $ 704,243