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Investments Accounted for Using Equity Method - Additional Information (Detail) - TWD ($) shares in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 20, 2015 | Jun. 30, 2015 | Apr. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of associates [line items] |  |  |  |  |  |  |  |
Gain (loss) on disposal of investments accounted for using equity method, net |  |  |  |  |  |  | $ (260.0) | $ 2,492.1
VisEra Holding Company [member] | OmniVision Technologies Inc [member] |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |
Percentage of ownership interest acquired | 49.10% |  |  |  |  |  |  |
Xintec Inc. [member] |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |
Number of common shares sold |  |  | 2.2 |  |  |  |  |
Gain (loss) on disposal of investments accounted for using equity method, net |  |  | $ 43.6 |  |  |  |  |
Percentage of ownership | 41.40% |  |  | 35.40% |  |  |  |
Motech industries, Inc. [member] |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |
Number of common shares sold |  |  |  |  | 29.2 |  |  |
Gain (loss) on disposal of investments accounted for using equity method, net |  |  |  |  | $ 202.4 |  | $ (260.0) |
Percentage of ownership |  | 18.00% |  |  | 12.00% |  |  |
Vanguard International Semiconductor Corporation [member] |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |
Number of common shares sold |  |  |  |  |  | 82.0 |  |
Gain (loss) on disposal of investments accounted for using equity method, net |  |  |  |  |  | $ 2,273.2 |  |
Percentage of ownership |  |  |  |  |  | 28.30% | 28.00% |

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