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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
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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 |

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