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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, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |  |
Long-term bank loans (including current portion) | $ 9,549,328 |  | $ 10,476,570
Lease liabilities | 917,452 | $ 1,184,183 |
Lease obligations payable |  |  | 18,000
Guarantee deposits | 1,095 |  | 1,092
Total | 10,467,875 |  | 10,495,662
Within 1 year [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |  |
Long-term bank loans (including current portion) | 914,159 |  | 927,243
Lease liabilities | 36,806 |  |
Lease obligations payable |  |  | 18,000
Total | 950,965 |  | 945,243
1 to 3 years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |  |
Long-term bank loans (including current portion) | 1,786,842 |  | 1,814,344
Lease liabilities | 60,111 |  |
Total | 1,846,953 |  | 1,814,344
3 to 5 years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |  |
Long-term bank loans (including current portion) | 6,848,327 |  | 7,734,983
Lease liabilities | 57,836 |  |
Total | 6,906,163 |  | 7,734,983
Over 5 years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |  |
Lease liabilities | 762,699 |  |
Guarantee deposits | 1,095 |  | 1,092
Total | $ 763,794 |  | $ 1,092

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