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Segment Information - Geographic Information of Revenue (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | $ 27,400,035 | $ 987,745 | $ 23,011,381 | $ 20,337,881
ROC [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 21,608,567 |  | 18,341,726 | 15,875,027
Japan [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 1,768,460 |  | 1,291,026 | 1,905,032
Singapore [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 1,630,733 |  | 1,838,394 | 1,333,114
People's Republic of China ("PRC") [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 1,899,362 |  | 1,105,535 | 789,496
Others [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | $ 492,913 |  | $ 434,700 | $ 435,212

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