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Investments Accounted for Using the Equity Method - Summary of Investments in Associates Accounted for Using the Equity Method (Detail) $ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
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Jul. 31, 2016 | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2017 USD ($)
Disclosure of associates and joint ventures [line items] |  |  |  |
Investments in associates |  | $ 48,267,237 | $ 49,154,140 | $ 1,628,449
Siliconware Precision Industries Co., Ltd. [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Main Business |  | Engaged in assembly, testing and turnkey services of integrated circuits |  |
Operating Location |  | ROC |  |
Percentages of ownership held by the Group |  | 33.29% | 33.29% |
Deca Technologies Inc. [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Main Business |  | Holding company and the group engaged in manufacturing, development and marketing of wafer level packaging and interconnect technology |  |
Operating Location |  | British Cayman Islands |  |
Investments in associates |  |  | $ 1,813,677 |
Percentages of ownership held by the Group | 22.07% | 22.04% | 22.07% |
Hung Ching Development & Construction Co. [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Main Business |  | Engaged in the development, construction and leasing of real estate properties |  |
Operating Location |  | ROC |  |
Percentages of ownership held by the Group |  | 26.22% | 26.22% |
Hung Ching Kwan Co. [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Main Business |  | Engaged in the leasing of real estate properties |  |
Operating Location |  | ROC |  |
Percentages of ownership held by the Group |  | 27.31% | 27.31% |
Advanced Microelectronic Products Inc. [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Main Business |  | Engaged in integrated circuit |  |
Operating Location |  | ROC |  |
Investments in associates |  |  | $ 264,434 |
Percentages of ownership held by the Group |  | 38.76% | 38.76% |
Cost [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Investments in associates |  | $ 48,567,386 | $ 49,454,289 | 1,638,576
Cost [member] | Siliconware Precision Industries Co., Ltd. [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Investments in associates |  | 45,210,371 | 45,898,225 | 1,525,316
Cost [member] | Deca Technologies Inc. [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Investments in associates |  | 1,583,124 | 1,813,677 | 53,412
Cost [member] | Hung Ching Development & Construction Co. [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Investments in associates |  | 1,248,711 | 1,156,833 | 42,129
Cost [member] | Hung Ching Kwan Co. [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Investments in associates |  | 309,630 | 321,120 | 10,447
Cost [member] | Advanced Microelectronic Products Inc. [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Investments in associates |  | 215,550 | 264,434 | 7,272
Deferred gain on transfer of land [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Investments in associates |  | $ 300,149 | $ 300,149 | $ 10,127

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