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Cash Flows Information - Change in Liabilities Arising From Financing Activities (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Disclosure Of Non Cash Investing Activities [line items] |  |  |  |
Beginning balance | $ 198,147,734 | $ 6,755,178 | $ 76,511,879 | $ 111,070,988
Adjustments on initial application of IFRS 16 (Note 3) |  | 203,435 |  |
Adjusted balance | 208,132,097 | 6,958,613 |  |
Net financing cash flows | 15,104,066 | 504,984 | 101,653,172 | (19,636,346)
Interest under operating activities | 1,766 | 59 |  |
Lease liabilities | 536,216 | 17,928 |  |
Non-cash changes |  |  |  |
Acquisition through business combinations (Note 30) | 2,508,101 | 83,855 | 24,157,174 |
Bonds conversion |  |  | (4,457,191) | (11,650,369)
Reclassification for the application of IFRS 9 |  |  | (1,301,994) |
Amortization of issuance cost | 200,673 | 6,709 | 216,973 | 325,253
Effects of foreign currency exchange | (2,261,592) | (75,614) | 1,367,721 | (3,597,647)
Lease modifications | (239,321) | (8,002) |  |
Ending balance | 223,982,006 | 7,488,532 | 198,147,734 | 76,511,879
Previously stated [member] |  |  |  |
Disclosure Of Non Cash Investing Activities [line items] |  |  |  |
Beginning balance | 202,047,368 |  |  |
Non-cash changes |  |  |  |
Ending balance |  |  | 202,047,368 |
Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure Of Non Cash Investing Activities [line items] |  |  |  |
Adjustments on initial application of IFRS 16 (Note 3) | 6,084,729 |  |  |
Short-term borrowings [member] |  |  |  |
Disclosure Of Non Cash Investing Activities [line items] |  |  |  |
Beginning balance | 43,263,469 | 1,576,834 | 17,962,471 | 20,955,522
Adjusted balance | 47,163,103 | 1,576,834 |  |
Net financing cash flows | (4,683,142) | (156,574) | 22,327,813 | (2,038,993)
Reclassification of foreign currency borrowings which lift to hedge foreign currency equity instruments | (1,499,000) | (50,117) |  |
Non-cash changes |  |  |  |
Acquisition through business combinations (Note 30) | 656,820 | 21,960 | 3,619,858 |
Reclassification for the application of IFRS 9 |  |  | (1,301,994) |
Effects of foreign currency exchange | (1,065,452) | (35,622) | 655,321 | (954,058)
Ending balance | 40,572,329 | 1,356,481 | 43,263,469 | 17,962,471
Short-term borrowings [member] | Previously stated [member] |  |  |  |
Disclosure Of Non Cash Investing Activities [line items] |  |  |  |
Beginning balance | 47,163,103 |  |  |
Non-cash changes |  |  |  |
Ending balance |  |  | 47,163,103 |
Bonds payable [member] |  |  |  |
Disclosure Of Non Cash Investing Activities [line items] |  |  |  |
Beginning balance | 16,985,936 | 567,902 | 23,142,780 | 36,999,903
Adjusted balance | 16,985,936 | 567,902 |  |
Net financing cash flows | 19,279,033 | 644,568 | (6,185,600) | (1,123,972)
Non-cash changes |  |  |  |
Acquisition through business combinations (Note 30) | 245,664 | 8,213 | 4,457,191 |
Bonds conversion |  |  | (4,457,191) | (11,650,369)
Amortization of issuance cost | 11,522 | 385 | 28,756 | 319,463
Effects of foreign currency exchange |  |  |  | (1,402,245)
Ending balance | 36,522,155 | 1,221,068 | 16,985,936 | 23,142,780
Bonds payable [member] | Previously stated [member] |  |  |  |
Disclosure Of Non Cash Investing Activities [line items] |  |  |  |
Beginning balance | 16,985,936 |  |  |
Non-cash changes |  |  |  |
Ending balance |  |  | 16,985,936 |
Long-term borrowings [member] |  |  |  |
Disclosure Of Non Cash Investing Activities [line items] |  |  |  |
Beginning balance | 137,898,329 | 4,610,442 | 35,406,628 | 53,115,563
Adjusted balance | 137,898,329 | 4,610,442 |  |
Net financing cash flows | 1,144,731 | 38,272 | 85,510,959 | (16,473,381)
Reclassification of foreign currency borrowings which lift to hedge foreign currency equity instruments | 1,499,000 | 50,117 |  |
Non-cash changes |  |  |  |
Acquisition through business combinations (Note 30) | 1,523,968 | 50,952 | 16,080,125 |
Amortization of issuance cost | 189,151 | 6,324 | 188,217 | 5,790
Effects of foreign currency exchange | (1,176,581) | (39,338) | 712,400 | (1,241,344)
Ending balance | 141,078,598 | 4,716,769 | 137,898,329 | $ 35,406,628
Long-term borrowings [member] | Previously stated [member] |  |  |  |
Disclosure Of Non Cash Investing Activities [line items] |  |  |  |
Beginning balance | 137,898,329 |  |  |
Non-cash changes |  |  |  |
Ending balance |  |  | $ 137,898,329 |
Lease liabilities [member] |  |  |  |
Disclosure Of Non Cash Investing Activities [line items] |  |  |  |
Adjustments on initial application of IFRS 16 (Note 3) |  | 203,435 |  |
Adjusted balance | 6,084,729 | 203,435 |  |
Net financing cash flows | (636,556) | (21,282) |  |
Interest under operating activities | 1,766 | 59 |  |
Lease liabilities | 536,216 | 17,928 |  |
Non-cash changes |  |  |  |
Acquisition through business combinations (Note 30) | 81,649 | 2,730 |  |
Effects of foreign currency exchange | (19,559) | (654) |  |
Lease modifications | (239,321) | (8,002) |  |
Ending balance | 5,808,924 | $ 194,214 |  |
Lease liabilities [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure Of Non Cash Investing Activities [line items] |  |  |  |
Adjustments on initial application of IFRS 16 (Note 3) | $ 6,084,729 |  |  |

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