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Financial Risk Management and Fair Values of Financial Instruments - Summary of Movements of Level 3 (Detail) - TWD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about financial instruments [Line Items] |  |
Movement of financial instruments beginning balance | $ 272,375 | $ 132,846
Gains or losses recognized in profit or loss Recorded as non-operating income (expenses) | (941) | (670)
Gains or losses recognized in other comprehensive gains (losses) Recorded as unrealized gains on valuation of financial assets at fair value through other comprehensive income | 122,514 | 140,199
Sold in the period | (9,427) |
Movement of financial instruments ending balance | 384,521 | 272,375
Debt instruments [member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Movement of financial instruments beginning balance | 10,368 | 11,038
Gains or losses recognized in profit or loss Recorded as non-operating income (expenses) | (941) | (670)
Sold in the period | (9,427) |
Movement of financial instruments ending balance |  | 10,368
Equity instruments [member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Movement of financial instruments beginning balance | 262,007 | 121,808
Gains or losses recognized in other comprehensive gains (losses) Recorded as unrealized gains on valuation of financial assets at fair value through other comprehensive income | 122,514 | 140,199
Movement of financial instruments ending balance | $ 384,521 | $ 262,007

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