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Operating Segments Information - Summary of Revenue from Major Products and Services (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Disclosure of products and services [line items] |  |  |  |
OPERATING REVENUES | $ 290,441,208 | $ 9,798,961 | $ 274,884,107 | $ 283,302,536
Packaging service [member] |  |  |  |
Disclosure of products and services [line items] |  |  |  |
OPERATING REVENUES | 126,225,119 | 4,258,607 | 125,282,829 | 116,607,314
Testing service [member] |  |  |  |
Disclosure of products and services [line items] |  |  |  |
OPERATING REVENUES | 26,157,277 | 882,499 | 27,031,750 | 25,191,916
Electronic components manufacturing service [member] |  |  |  |
Disclosure of products and services [line items] |  |  |  |
OPERATING REVENUES | 133,948,016 | 4,519,164 | 115,395,130 | 138,242,100
Other products and services [member] |  |  |  |
Disclosure of products and services [line items] |  |  |  |
OPERATING REVENUES | $ 4,110,796 | $ 138,691 | $ 7,174,398 | $ 3,261,206

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