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Related Party Transactions - Summary of Significant Transactions between the Company and Other Related Parties (Detail) $ in Millions, $ in Millions | 12 Months Ended |
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Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($) | Dec. 31, 2017 USD ($)
Disclosure of transactions between related parties [line items] |  |  |  |
Net revenue from sale of goods | $ 8,496.1 | $ 5,929.1 | $ 4,255.2 |
Receivables from related parties | 1,184.1 | 969.5 |  | $ 39.9
Payables to related parties | 1,656.4 | 1,262.2 |  |
Other receivables from related parties | 171.1 | 146.8 |  | $ 5.8
Manufacturing expenses | 2,196.1 | 1,389.2 | 2,334.7 |
Research and development expenses | 69.8 | 161.7 | 144.2 |
Global Unichip Corporation [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Receivables from related parties | 1,022.9 | 969.1 |  |
Xintec Inc. [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Receivables from related parties | 161.2 | 0.4 |  |
Payables to related parties | 817.9 | 124.6 |  |
Systems on Silicon Manufacturing Company Pte Ltd. [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Payables to related parties | 407.0 | 506.1 |  |
Other receivables from related parties | 83.1 | 60.7 |  |
Vanguard International Semiconductor Corporation [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Payables to related parties | 410.0 | 587.4 |  |
Other receivables from related parties | 78.2 | 86.0 |  |
Associates [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Net revenue from sale of goods | 8,496.0 | 5,929.1 | 4,254.0 |
Net revenue from royalties | 482.5 | 516.7 | 489.4 |
Related Party Categories | 9,904.6 | 10,108.2 | 11,126.4 |
Acquisition of property, plant and equipment |  |  | 26.2 |
Manufacturing expenses | 2,196.1 | 1,389.2 | 2,321.9 |
Research and development expenses | 69.8 | 161.7 | 142.8 |
Joint venture [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Net revenue from sale of goods | 0.1 |  |  |
Manufacturing expenses |  |  | 12.8 |
Research and development expenses |  |  | 1.4 |
Other related parties [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Net revenue from sale of goods |  |  | 1.2 |
General and administrative expenses | 101.5 | 60.0 | $ 60.0 |
Other associates [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Payables to related parties | 21.5 | 44.1 |  |
Other receivables from related parties | $ 9.8 | $ 0.1 |  |

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