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Disposal of Subsidiaries - Summary of Analysis of Assets and Liabilities on Date Control was Lost (Detail) - SPIL Cayman Holdings Limited [member]
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2021
USD ($)
Current assets        
Cash and cash equivalents $ 2,625,715 $ 94,655 $ 200,347  
Inventories 2,284,880 82,368 239,865  
Other current assets 1,215,992 43,835 111,913  
Trade and other receivables 4,505,531   318,425 $ 162,420
Non-Current Assets        
Property, plant and equipment 16,693,129 601,770 7,546,413  
Right-of-use assets 181,855 6,556 812,861  
Investment property 787,250 28,379    
Goodwill 310,711 11,201    
Deferred tax assets 659,972 23,792 298,217  
Other non-current assets 308,500 11,122 43,482  
Current Liabilities        
Short-term borrowings (2,443,005) (88,068)    
Trade and other payables (5,949,592) (214,477) (1,739,330)  
Current portion of long-term borrowings     (1,746,000)  
Other current liabilities (647,027) (23,325) (24,564)  
Non-Current Liabilities        
Long-term borrowings     (2,947,682)  
Deferred tax liabilities (200,899) (7,242) (796)  
Lease liabilities – non-current (8,150) (294)    
Other non-current liabilities (156,863) (5,655)    
Net assets disposed of $ 20,167,999 $ 727,037 $ 3,113,151