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Supplementary Cash Flow Information - Reconciliation of Liabilities Arising from Financing Activities (Detail) - TWD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | $ 9,790,610 | $ 10,612,745 | $ 10,751,409
Effects on initial application of IFRS 16 | 884,275 |  |
Adjusted balance at January 1, 2019 | 10,674,885 |  |
Changes in cash flow from financing activities | (804,608) | (859,382) | (155,379)
Adjustment to right-of-use assets | (148,512) |  |
Reclassification to payable on equipment from lease liabilities | (9,000) |  |
Amortization Loan Fees | 8,577 | 37,247 | 16,715
Amortization Of Interest Expense | 14,349 |  |
Ending balance | 9,735,691 | 9,790,610 | 10,612,745
Long-term bank loans (include the current portion) [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | 9,789,518 | 9,642,021 | 10,750,005
Adjusted balance at January 1, 2019 | 9,789,518 |  |
Changes in cash flow from financing activities | (756,450) | 110,250 | (1,124,699)
Amortization Loan Fees | 8,577 | 37,247 | 16,715
Ending balance | 9,041,645 | 9,789,518 | 9,642,021
Short-term bank loans [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  | 969,353 |
Changes in cash flow from financing activities |  | (969,353) | 969,353
Ending balance |  |  | 969,353
Guarantee deposits [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | 1,092 | 1,371 | 1,404
Adjusted balance at January 1, 2019 | 1,092 |  |
Changes in cash flow from financing activities | 3 | (279) | (33)
Ending balance | 1,095 | $ 1,092 | $ 1,371
Lease liabilities [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Effects on initial application of IFRS 16 | 884,275 |  |
Adjusted balance at January 1, 2019 | 884,275 |  |
Changes in cash flow from financing activities | (48,161) |  |
Adjustment to right-of-use assets | (148,512) |  |
Reclassification to payable on equipment from lease liabilities | (9,000) |  |
Amortization Of Interest Expense | 14,349 |  |
Ending balance | $ 692,951 |  |

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