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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
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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

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