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Segment Information - Net Revenue from Customers Representing at Least 10% of Total 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 major customers [Line Items] |  |  |  |
Net revenue | $ 27,400,035 | $ 987,745 | $ 23,011,381 | $ 20,337,881
Percentage of total revenue | 100.00% | 100.00% | 100.00% | 100.00%
Customer A [member] |  |  |  |
Disclosure of major customers [Line Items] |  |  |  |
Net revenue | $ 5,681,277 |  | $ 5,088,544 | $ 4,756,755
Percentage of total revenue | 21.00% | 21.00% | 22.00% | 23.00%
Customer M [Member] |  |  |  |
Disclosure of major customers [Line Items] |  |  |  |
Net revenue | $ 2,832,088 |  | $ 1,674,801 | $ 1,259,269
Percentage of total revenue | 10.00% | 10.00% | 7.00% | 6.00%
Customer K [member] |  |  |  |
Disclosure of major customers [Line Items] |  |  |  |
Net revenue | $ 2,519,631 |  | $ 2,332,914 | $ 2,419,612
Percentage of total revenue | 9.00% | 9.00% | 10.00% | 12.00%
Customer B [Member] |  |  |  |
Disclosure of major customers [Line Items] |  |  |  |
Net revenue | $ 2,484,611 |  | $ 2,365,945 | $ 1,679,344
Percentage of total revenue | 9.00% | 9.00% | 10.00% | 8.00%
Customer C [member] |  |  |  |
Disclosure of major customers [Line Items] |  |  |  |
Net revenue | $ 2,268,439 |  | $ 2,143,130 | $ 2,048,260
Percentage of total revenue | 8.00% | 8.00% | 9.00% | 10.00%

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