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Disposal of Subsidiaries - Summary of Net Cash Inflow on Disposal of Susbsidiaries (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 Net Cash Inflow On Disposal Of Subsidiaries [Line Items]      
Consideration received in cash and cash equivalents | ¥ ¥ 966,000    
SPIL Cayman Holdings Limited [member]      
Disclosure Of Net Cash Inflow On Disposal Of Subsidiaries [Line Items]      
Consideration received in cash and cash equivalents   $ 36,939,133 $ 4,078,844
Less: Cash and cash equivalent balances disposed of   (2,625,715) (200,347)
Other receivables (the outstanding receivables of consideration, net of relevant expenditure)   (10,533,600) (161,458)
Net cash inflow on disposals of subsidiaries   $ 23,779,818 $ 3,717,039