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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
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
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 4,078,844 $ 36,939,133 $ 1,331,620 $ 4,078,844
Less: Cash and cash equivalent balances disposed of (200,347) (2,625,715) (94,655)  
Other receivables (the outstanding receivables of consideration, net of relevant expenditure) (161,458) (10,533,600) (379,726)  
Net cash inflow on disposals of subsidiaries $ 3,717,039 $ 23,779,818 $ 857,239