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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
CNY (¥)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
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   $ 36,939,133 $ 4,078,844
Net assets disposed of   (20,167,999) (3,113,151)
Reclassification of accumulated exchange difference from equity to profit or loss due to the loss of control   569,284 (162,940)
Gain on disposal of   $ 17,340,418 $ 802,753