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Changes in liabilities from financing activities - Reconciliation of Liabilities Arising from Financing Activities (Detail) - TWD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | $ 9,735,691 | $ 9,790,610 | $ 10,612,745
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 | (1,411,210) | (804,608) | (859,382)
Adjustment to right-of-use assets | 249,030 | (148,512) |
Reclassification to payable on equipment from lease liabilities |  | (9,000) |
Reclassification | 20,000 |  |
Amortization of loan fees | 7,581 | 8,577 | 37,247
Amortization Of Interest Expense | 24,638 | 14,349 |
Ending balance | 8,625,730 | 9,735,691 | 9,790,610
Long-term bank loans (include the current portion) [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | 9,041,645 | 9,789,518 | 9,642,021
Adjusted balance at January 1, 2019 |  | 9,789,518 |
Changes in cash flow from financing activities | (1,326,857) | (756,450) | 110,250
Amortization of loan fees | 7,581 | 8,577 | 37,247
Amortization Of Interest Expense | 11,196 |  |
Ending balance | 7,733,565 | 9,041,645 | 9,789,518
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)
Guarantee deposits [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | 1,095 | 1,092 | 1,371
Adjusted balance at January 1, 2019 |  | 1,092 |
Changes in cash flow from financing activities | 575 | 3 | (279)
Reclassification | 20,000 |  |
Ending balance | 21,670 | 1,095 | $ 1,092
Lease liabilities [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | 692,951 |  |
Effects on initial application of IFRS 16 |  | 884,275 |
Adjusted balance at January 1, 2019 |  | 884,275 |
Changes in cash flow from financing activities | (84,928) | (48,161) |
Adjustment to right-of-use assets | 249,030 | (148,512) |
Reclassification to payable on equipment from lease liabilities |  | (9,000) |
Amortization Of Interest Expense | 13,442 | 14,349 |
Ending balance | $ 870,495 | $ 692,951 |

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