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Disposal of Subsidiaries - Summary of Gain on Disposal of Subsidiaries (Detail)
$ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2020
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Disclosure of gain from disposals of subsidiaries [line items]        
Total consideration $ 966,000      
SPIL Cayman Holdings Limited [member]        
Disclosure of gain from disposals of subsidiaries [line items]        
Total consideration $ 4,078,844 $ 36,939,133 $ 1,331,620 $ 4,078,844
Net assets disposed of   (20,167,999) (727,037) (3,113,151)
Reclassification of accumulated exchange difference from equity to profit or loss due to the loss of control   569,284 20,522 (162,940)
Gain on disposal of   $ 17,340,418 $ 625,105 $ 802,753