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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] - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 2,625,715 $ 200,347
Inventories 2,284,880 239,865
Other current assets 1,215,992 111,913
Trade and other receivables 4,505,531 318,425
Non-Current Assets    
Property, plant and equipment 16,693,129 7,546,413
Right-of-use assets 181,855 812,861
Investment property 787,250  
Goodwill 310,711  
Deferred tax assets 659,972 298,217
Other non-current assets 308,500 43,482
Current Liabilities    
Short-term borrowings (2,443,005)  
Trade and other payables (5,949,592) (1,739,330)
Current portion of long-term borrowings   (1,746,000)
Other current liabilities (647,027) (24,564)
Non-Current Liabilities    
Long-term borrowings   (2,947,682)
Deferred tax liabilities (200,899) (796)
Lease liabilities – non-current (8,150)  
Other non-current liabilities (156,863)  
Net assets disposed of $ 20,167,999 $ 3,113,151