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Application of New and Revised International Financial Reporting Standards as Issued by the International Accounting Standards Board ("IASB") ( Collectively, "IFRSs") - Schedule of Anticipated Impact on Assets, Liabilities and Equity Of Retrospective Application of the Requirements for the Classification, Measurement and Impairment of Financial Assets (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Jan. 01, 2018 USD ($) | Jan. 01, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
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Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Inventories | $ 1,196,584 | $ 36,627,451 |  |  | $ 24,260,911 |  |
Contract assets - current | 146,635 | 4,488,500 |  |  |  |  |
Investments accounted for using the equity method | 304,224 | 9,312,308 |  |  | 48,753,751 | $ 49,824,690 |
Deferred tax assets | 166,885 | 5,108,357 |  |  | 4,001,821 |  |
Total assets | 17,447,301 | 534,061,927 |  |  | 363,922,272 |  |
Current tax liabilities | 221,533 | 6,781,136 |  |  | 7,619,328 |  |
Deferred tax liabilities | 189,700 | 5,806,713 |  |  | 4,961,487 |  |
Total liabilities | 10,291,865 | 315,034,005 |  |  | 162,612,085 |  |
Retained earnings | 776,132 | 23,757,415 |  |  | 73,718,545 |  |
NON-CONTROLLING INTERESTS | 576,265 | 17,639,487 |  |  | 13,190,129 |  |
Total equity | $ 7,155,436 | $ 219,027,922 |  |  | $ 201,310,187 | $ 166,841,165 | $ 165,924,980
IAS 18 [member] |  |  |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Inventories |  |  | $ 792,581 | $ 24,260,911 |  |  |
Investments accounted for using the equity method |  |  | 1,592,739 | 48,753,751 |  |  |
Deferred tax assets |  |  | 130,736 | 4,001,821 |  |  |
Total assets |  |  | 2,516,056 | 77,016,483 |  |  |
Current tax liabilities |  |  | 248,916 | 7,619,328 |  |  |
Deferred tax liabilities |  |  | 162,087 | 4,961,487 |  |  |
Total liabilities |  |  | 411,003 | 12,580,815 |  |  |
Retained earnings |  |  | 2,408,316 | 73,718,545 |  |  |
NON-CONTROLLING INTERESTS |  |  | 430,909 | 13,190,129 |  |  |
Total equity |  |  | 2,839,225 | 86,908,674 |  |  |
Adoption of IFRS 15 [member] |  |  |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Inventories |  |  | 747,440 | 22,879,133 |  |  |
Contract assets - current |  |  | 64,394 | 1,971,107 |  |  |
Investments accounted for using the equity method |  |  | 1,594,050 | 48,793,890 |  |  |
Deferred tax assets |  |  | 130,498 | 3,994,534 |  |  |
Total assets |  |  | 2,536,382 | 77,638,664 |  |  |
Current tax liabilities |  |  | 249,082 | 7,624,406 |  |  |
Deferred tax liabilities |  |  | 165,030 | 5,051,558 |  |  |
Total liabilities |  |  | 414,112 | 12,675,964 |  |  |
Retained earnings |  |  | 2,425,364 | 74,240,394 |  |  |
NON-CONTROLLING INTERESTS |  |  | 431,078 | 13,195,312 |  |  |
Total equity |  |  | 2,856,442 | 87,435,706 |  |  |
Adjustments arising from initial application [member] |  |  |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Inventories |  |  | (45,141) | (1,381,778) |  |  |
Contract assets - current |  |  | 64,394 | 1,971,107 |  |  |
Investments accounted for using the equity method |  |  | 1,311 | 40,139 |  |  |
Deferred tax assets |  |  | (238) | (7,287) |  |  |
Total assets |  |  | 20,326 | 622,181 |  |  |
Current tax liabilities |  |  | 166 | 5,078 |  |  |
Deferred tax liabilities |  |  | 2,943 | 90,071 |  |  |
Total liabilities |  |  | 3,109 | 95,149 |  |  |
Retained earnings |  |  | 17,048 | 521,849 |  |  |
NON-CONTROLLING INTERESTS |  |  | 169 | 5,183 |  |  |
Total equity |  |  | $ 17,217 | $ 527,032 |  |  |

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