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Consolidated Statements of Changes in Equity $ in Thousands, $ in Thousands | USD ($) | TWD ($) | Share capital [member] USD ($) shares | Share capital [member] TWD ($) shares | Capital surplus [member] USD ($) | Capital surplus [member] TWD ($) | Legal reserve [member] TWD ($) | Special reserve [member] USD ($) | Special reserve [member] TWD ($) | Unappropriated earnings [member] USD ($) | Unappropriated earnings [member] TWD ($) | Retained earnings [member] USD ($) | Retained earnings [member] TWD ($) | Exchange differences on translating foreign operations [member] USD ($) | Exchange differences on translating foreign operations [member] TWD ($) | Unrealized gain (loss) on available-for-sale financial assets [member] TWD ($) | Unrealized gain (loss) on financial assets at fair value through other comprehensive income [member] USD ($) | Unrealized gain (loss) on financial assets at fair value through other comprehensive income [member] TWD ($) | Other equity[member] USD ($) | Other equity[member] TWD ($) | Treasury shares [member] USD ($) | Treasury shares [member] TWD ($) | Equity Attributable to Owners of the Company [member] USD ($) | Equity Attributable to Owners of the Company [member] TWD ($) | Non-controlling interests [member] USD ($) | Non-controlling interests [member] TWD ($)
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Balance at January 1 at Dec. 31, 2015 |  | $ 165,924,980 |  | $ 79,185,660 |  | $ 23,758,550 | $ 12,649,145 |  | $ 3,353,938 |  | $ 37,696,865 |  | $ 53,699,948 |  | $ 4,492,671 | $ 588,119 |  |  |  | $ 5,080,790 |  | $ (7,292,513) |  | $ 154,432,435 |  | $ 11,492,545
Beginning balance, shares at Dec. 31, 2015 | shares |  |  | 7,910,428,000 | 7,910,428,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change from investments in associates and joint ventures accounted for using the equity method |  | 95,495 |  |  |  | 51,959 |  |  |  |  |  |  |  |  |  | 43,536 |  |  |  | 43,536 |  |  |  | 95,495 |  |
Net profit for the year |  | 22,577,861 |  |  |  |  |  |  |  |  | 21,324,423 |  | 21,324,423 |  |  |  |  |  |  |  |  |  |  | 21,324,423 |  | 1,253,438
Other comprehensive income (loss) for the year, net of income tax |  | (7,959,259) |  |  |  |  |  |  |  |  | (402,184) |  | (402,184) |  | (6,136,294) | (828,969) |  |  |  | (6,965,263) |  |  |  | (7,367,447) |  | (591,812)
Total comprehensive income (loss) |  | 14,618,602 |  |  |  |  |  |  |  |  | 20,922,239 |  | 20,922,239 |  | (6,136,294) | (828,969) |  |  |  | (6,965,263) |  |  |  | 13,956,976 |  | 661,626
Appropriation of earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal reserve |  |  |  |  |  |  | 1,947,887 |  |  |  | (1,947,887) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends distributed by the Company |  | (12,476,779) |  |  |  |  |  |  |  |  | (12,476,779) |  | (12,476,779) |  |  |  |  |  |  |  |  |  |  | (12,476,779) |  |
Appropriated retained earnings |  | (12,476,779) |  |  |  |  | 1,947,887 |  |  |  | (14,424,666) |  | (12,476,779) |  |  |  |  |  |  |  |  |  |  | (12,476,779) |  |
Issue of dividends received by subsidiaries from the Company |  | 233,013 |  |  |  | 233,013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 233,013 |  |
Partial disposal of interests in subsidiaries and additional acquisition of majority-owned subsidiaries |  |  |  |  |  | (20,552) |  |  |  |  | (5,884) |  | (5,884) |  |  |  |  |  |  |  |  |  |  | (26,436) |  | 26,436
Changes in percentage of ownership interest in subsidiaries |  | (2,825,773) |  |  |  | (1,912,887) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,912,887) |  | (912,886)
Issue of ordinary shares under employee share options |  | 983,117 |  | $ 382,380 |  | 600,737 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 983,117 |  |
Issue of ordinary shares under employee share options, shares |  |  | 35,756,000 | 35,756,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interests arising from acquisition of subsidiaries |  | 42,857 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,857
Cash dividends distributed by subsidiaries |  | (237,850) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (237,850)
Additional non-controlling interest arising on issue of employee share options by subsidiaries |  | 483,503 |  |  |  | (444,320) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (444,320) |  | 927,823
Balance at December 31 at Dec. 31, 2016 |  | 166,841,165 |  | $ 79,568,040 |  | 22,266,500 | 14,597,032 |  | 3,353,938 |  | 44,188,554 |  | 62,139,524 |  | (1,643,623) | (197,314) |  |  |  | (1,840,937) |  | (7,292,513) |  | 154,840,614 |  | 12,000,551
Ending balance, shares at Dec. 31, 2016 | shares |  |  | 7,946,184,000 | 7,946,184,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change from investments in associates and joint ventures accounted for using the equity method |  | 1,490 |  |  |  | 1,490 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,490 |  |
Net profit for the year |  | 24,497,060 |  |  |  |  |  |  |  |  | 22,819,119 |  | 22,819,119 |  |  |  |  |  |  |  |  |  |  | 22,819,119 |  | 1,677,941
Other comprehensive income (loss) for the year, net of income tax |  | (4,637,933) |  |  |  |  |  |  |  |  | 175,100 |  | 175,100 |  | (5,090,036) | 619,884 |  |  |  | (4,470,152) |  |  |  | (4,295,052) |  | (342,881)
Total comprehensive income (loss) |  | 19,859,127 |  |  |  |  |  |  |  |  | 22,994,219 |  | 22,994,219 |  | (5,090,036) | 619,884 |  |  |  | (4,470,152) |  |  |  | 18,524,067 |  | 1,335,060
Appropriation of earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal reserve |  |  |  |  |  |  | 2,168,034 |  |  |  | (2,168,034) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends distributed by the Company |  | (11,415,198) |  |  |  |  |  |  |  |  | (11,415,198) |  | (11,415,198) |  |  |  |  |  |  |  |  |  |  | (11,415,198) |  |
Appropriated retained earnings |  | (11,415,198) |  |  |  |  | 2,168,034 |  |  |  | (13,583,232) |  | (11,415,198) |  |  |  |  |  |  |  |  |  |  | (11,415,198) |  |
Issue of ordinary shares for capital increase by cash |  | 10,290,000 |  | $ 3,000,000 |  | 7,290,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,290,000 |  |
Issue of ordinary shares for capital increase by cash, shares | shares |  |  | 300,000,000 | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of ordinary shares under conversion of bonds |  | 13,900,482 |  | $ 4,242,577 |  | 9,657,905 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,900,482 |  |
Issue of ordinary shares under conversion of bonds, shares | shares |  |  | 424,258,000 | 424,258,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of dividends received by subsidiaries from the Company |  | 200,977 |  |  |  | 200,977 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,977 |  |
Changes in percentage of ownership interest in subsidiaries |  |  |  |  |  | 3,055 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,055 |  | (3,055)
Issue of ordinary shares under employee share options |  | 1,667,759 |  | $ 570,170 |  | 1,256,789 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,826,959 |  | (159,200)
Issue of ordinary shares under employee share options, shares |  |  | 67,637,000 | 67,637,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends distributed by subsidiaries |  | (246,440) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (246,440)
Additional non-controlling interest arising on issue of employee share options by subsidiaries |  | 210,825 |  |  |  | (52,388) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (52,388) |  | 263,213
Balance at December 31 (Adjusted Balance [member]) at Dec. 31, 2017 |  | 201,914,633 |  | $ 87,380,787 |  | 40,624,328 | 16,765,066 |  | 3,353,938 |  | 54,485,857 |  | 74,604,861 |  | (6,733,659) |  |  | $ 135,517 |  | (6,598,142) |  | (7,292,513) |  | 188,719,321 |  | 13,195,312
Balance at December 31 at Dec. 31, 2017 |  | 201,310,187 |  | $ 87,380,787 |  | 40,624,328 | 16,765,066 |  | 3,353,938 |  | 53,599,541 |  | 73,718,545 | $ (219,982) | (6,733,659) | 422,570 |  |  |  | (6,311,089) |  | (7,292,513) |  | 188,120,058 |  | 13,190,129
Ending balance, shares at Dec. 31, 2017 | shares |  |  | 8,738,079,000 | 8,738,079,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of retrospective applications |  | 604,446 |  |  |  |  |  |  |  |  | 886,316 |  | 886,316 |  |  | $ (422,570) |  | 135,517 |  | (287,053) |  |  |  | 599,263 |  | 5,183
Change from investments in associates and joint ventures accounted for using the equity method |  | 1,500,100 |  |  |  | 1,411,899 |  |  |  |  | 88,201 |  | 88,201 |  |  |  |  |  |  |  |  |  |  | 1,500,100 |  |
Cash dividends paid from the capital surplus |  | (10,795,980) |  |  |  | (10,795,980) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (10,795,980) |  |
Other changes in the capital surplus |  | 872 |  |  |  | 872 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 872 |  |
Net profit for the year | $ 895,926 | 27,424,309 |  |  |  |  |  |  |  |  | 26,220,721 |  | 26,220,721 |  |  |  |  |  |  |  |  |  |  | 26,220,721 |  | 1,203,588
Other comprehensive income (loss) for the year, net of income tax | (27,855) | (852,632) |  |  |  |  |  |  |  |  | (146,194) |  | (146,194) |  | 562,794 |  |  | (1,016,860) |  | (454,066) |  |  |  | (600,260) |  | (252,372)
Total comprehensive income (loss) | 868,071 | 26,571,677 |  |  |  |  |  |  |  |  | 26,074,527 |  | 26,074,527 |  | 562,794 |  |  | (1,016,860) |  | (454,066) |  |  |  | 25,620,461 |  | 951,216
Appropriation of earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of the joint share exchange |  |  |  | $ (43,183,919) |  | 117,693,658 | $ (16,765,066) |  |  |  | (57,744,673) |  | (74,509,739) |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of the joint share exchange, shares | shares |  |  | (4,318,392,000) | (4,318,392,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buy-back of ordinary shares |  | (71,302) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (71,302) |  | (71,302) |  |
Cancellation of treasury shares |  |  |  | $ (1,218,520) |  | (1,480,903) |  |  |  |  | (2,705,285) |  | (2,705,285) |  |  |  |  |  |  |  |  | 5,404,708 |  |  |  |
Cancellation of treasury shares, shares | shares |  |  | (121,852,000) | (121,852,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of dividends received by subsidiaries from the Company |  | 182,354 |  |  |  | 182,354 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 182,354 |  |
Disposal of interest in associates and joint ventures accounted for using the equity method |  | (1,055,118) |  |  |  | (1,408,495) |  |  |  |  | 204,450 |  | 204,450 |  | 282,291 |  |  | (133,364) |  | 148,927 |  |  |  | (1,055,118) |  |
Differences between consideration and carrying amount arising from acquisition or disposal of subsidiaries |  | 1,640,159 |  |  |  | (1,142,856) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,142,856) |  | 2,783,015
Changes in percentage of ownership interest in subsidiaries |  | (1,919,986) |  |  |  | (1,118,102) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,118,102) |  | (801,884)
Issue of ordinary shares under employee share options |  | 788,141 |  | $ 238,796 |  | 549,345 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 788,141 |  |
Issue of ordinary shares under employee share options, shares |  |  | 23,879,000 | 23,879,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends distributed by subsidiaries |  | (424,815) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (424,815)
Additional non-controlling interest arising on issue of employee share options by subsidiaries |  | 697,187 |  |  |  | (1,239,456) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,239,456) |  | 1,936,643
Fair value through other comprehensive income - equity instruments |  |  |  |  |  |  |  |  |  |  | 400 |  | 400 |  |  |  |  | (400) |  | (400) |  |  |  |  |  |
Balance at December 31 at Dec. 31, 2018 | $ 7,155,436 | $ 219,027,922 | $ 1,411,864 | $ 43,217,144 | $ 4,680,714 | $ 143,276,664 |  | $ 109,570 | $ 3,353,938 | $ 666,562 | $ 20,403,477 | $ 776,132 | $ 23,757,415 | $ (192,374) | $ (5,888,574) |  | $ (33,163) | $ (1,015,107) | $ (225,537) | $ (6,903,681) | $ (64,002) | $ (1,959,107) | $ 6,579,171 | $ 201,388,435 | $ 576,265 | $ 17,639,487
Ending balance, shares at Dec. 31, 2018 | shares |  |  | 4,321,714,000 | 4,321,714,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of dividends recognised as distributions to owners of the parent. [Refer: Parent [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in equity resulting from the acquisition of subsidiaries. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in equity resulting from the appropriation of retained earnings. [Refer: Retained earnings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in equity resulting from the exercise of options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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