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Significant Contingent Liabilities and Unrecognized Commitments - Additional Information (Detail) € in Millions, $ in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 30, 1999 | Aug. 31, 2012 EUR (€) | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Research and development expense |  |  | $ 80,732.5 | $ 2,723.8 | $ 71,207.7 | $ 65,544.6
Letters of Credit [member] |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Amounts available under unused letters of credit | $ |  |  | $ 94.9 |  | $ 122.4 |
Systems on Silicon Manufacturing Company Pte Ltd. [member] |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Equity interest in joint venture | 32.00% |  | 39.00% | 39.00% |  |
Minimum collective purchase capacity required |  |  | 70.00% | 70.00% |  |
Maximum purchase capacity required |  |  | 28.00% | 28.00% |  |
NXP B.V [member] | Systems on Silicon Manufacturing Company Pte Ltd. [member] |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Equity interest in joint venture |  |  | 61.00% | 61.00% |  |
Technical Cooperation Agreement with Industrial Technology Research Institute [member] |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Maximum capacity that can be used as per agreement |  |  | 35.00% | 35.00% |  |
Term of agreement |  |  | 5 years | 5 years |  |
Renewal period of agreement |  |  | Automatically renewed for successive periods of five years unless otherwise terminated by either party with one year prior notice. | Automatically renewed for successive periods of five years unless otherwise terminated by either party with one year prior notice. |  |
Notice period for contract termination |  |  | 1 year | 1 year |  |
Customer Co-Investment Program of ASML [member] |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Aggregate investment done |  | € 837.8 |  |  |  |
Equity interest acquired |  | 5.00% |  |  |  |
Lock-in period of investment |  | 2 years 6 months |  |  |  |
Research and Development Funding Agreement with ASML [member] |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |
Research and development expense |  | € 276.0 |  |  |  |

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