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Application of New and Revised International Financial Reporting Standards As Issued By The International Accounting Standards Board - Schedule of Differences Between IFRS and IAS 18 Due to Adoption of IAS18 (Detail) $ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2018 TWD ($) $ / shares | Dec. 31, 2017 TWD ($) $ / shares | Dec. 31, 2016 TWD ($) $ / shares | Dec. 31, 2018 TWD ($)
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Increase in inventories | $ (302,179) | $ (9,249,714) | $ (2,907,848) | $ 3,156,759 |
Decrease in non-controlling interests | 386,156 | 11,820,227 | 246,440 | 3,063,623 |
Decrease in operating revenues | (12,123,242) | (371,092,421) | (290,441,208) | (274,884,107) |
Decrease in operating costs | (10,125,102) | (309,929,371) | (237,708,937) | (221,696,922) |
Increase in share of profit of associates and joint ventures | (15,689) | (480,244) | 525,782 | 1,503,910 |
Decrease in income tax expense | 147,448 | 4,513,369 | 6,523,603 | 5,390,844 |
TOTAL COMPREHENSIVE INCOME FOR THE YEAR | $ 868,071 | $ 26,571,677 | $ 19,859,127 | $ 14,618,602 |
Decrease in basic earnings per share | (per share) | $ 0.20 | $ 6.18 | $ 5.59 | $ 5.57 |
Decrease in diluted earnings per share | (per share) | $ 0.20 | $ 6.07 | $ 5.19 | $ 4.66 |
IAS 18 [member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Increase in inventories | $ 75,572 | $ 2,313,269 |  |  |
Decrease in contract assets - current | (146,961) | (4,498,500) |  |  |
Increase in trade receivables | 35,066 |  |  |  | $ 1,073,368
Decrease in investments accounted for using the equity method | (1,219) |  |  |  | (37,312)
Increase in deferred tax assets | 862 |  |  |  | 26,389
Decrease in assets | (36,680) | (1,122,786) |  |  |
Decrease in current tax liabilities | (1,536) |  |  |  | (47,028)
Decrease in deferred tax liabilities | (4,637) | (141,934) |  |  |
Decrease in liabilities | (6,173) | (188,962) |  |  |
Decrease in retained earnings | (30,490) | (933,310) |  |  |
Decrease in non-controlling interests | (17) | (514) |  |  |
Decrease in equity | (30,507) |  |  |  | $ (933,824)
Decrease in operating revenues | (15,523) | (475,155) |  |  |
Decrease in operating costs | (3,331) | (101,964) |  |  |
Increase in share of profit of associates and joint ventures | 92 | 2,828 |  |  |
Decrease in income tax expense | (2,676) | (81,908) |  |  |
Decrease in net profit and total comprehensive income for the year | (13,290) | (406,792) |  |  |
Increase (decrease) in net profit and total comprehensive income attributable to: Owners of the Company | (13,442) | (411,461) |  |  |
Non-controlling interests | 152 | 4,669 |  |  |
TOTAL COMPREHENSIVE INCOME FOR THE YEAR | $ (13,290) | $ (406,792) |  |  |
IAS 18 [member] | New Taiwan Dollar [member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Decrease in basic earnings per share |  | $ (0.10) |  |  |
Decrease in diluted earnings per share |  | $ (0.10) |  |  |
IAS 18 [member] | US Dollar [member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Decrease in basic earnings per share | $ 0.00 |  |  |  |
Decrease in diluted earnings per share | $ 0.00 |  |  |  |

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