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Financial Risk Management and Fair Values of Financial Instruments - Maturity Profile of Non-derivative Financial Liabilities Based on Contracted Undiscounted Payments (Detail) - TWD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Short-term bank loans | $ 733,523 |
Long-term bank loans | 9,766,486 | $ 8,091,523
Lease liabilities | 1,047,811 | 1,079,181
Guarantee deposits | 21,625 | 21,670
Total | 11,569,445 | 9,192,374
Within 1 year [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Short-term bank loans | 733,523 |
Long-term bank loans | 114,953 | 846,401
Lease liabilities | 182,186 | 145,594
Total | 1,030,662 | 991,995
1 to 3 years [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Long-term bank loans | 2,817,662 | 3,558,597
Lease liabilities | 119,748 | 160,146
Total | 2,937,410 | 3,718,743
3 to 5 years [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Long-term bank loans | 4,568,521 | 2,198,717
Lease liabilities | 54,113 | 54,689
Total | 4,622,634 | 2,253,406
Over 5 years [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Long-term bank loans | 2,265,350 | 1,487,808
Lease liabilities | 691,764 | 718,752
Guarantee deposits | 21,625 | 21,670
Total | $ 2,978,739 | $ 2,228,230

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