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Long Term Loans - Additional Information (Detail) - TWD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 4 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Apr. 30, 2016 | Dec. 31, 2014 | Dec. 31, 2017 | Dec. 31, 2013 | Apr. 30, 2014 | Dec. 31, 2012 | Sep. 30, 2010
Light Era Development Co., Ltd. (LED) [Member] | Chang Hwa Bank Secured Loan [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Early repayment of secured loan |  | $ 50 |  |  |  |  |  |  |  |
Light Era Development Co., Ltd. (LED) [Member] | Chang Hwa Bank Secured Loan [Member] | Extended Due September 2021 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Loan due date |  |  |  |  |  | September 2021 |  |  |  |
Light Era Development Co., Ltd. (LED) [Member] | Chang Hwa Bank Secured Loan [Member] | Due December 2017 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Secured loan |  |  |  |  |  |  |  |  | $ 400 |
Early repayment of secured loan |  |  | $ 50 |  |  |  | $ 350 |  |  |
Loan due date |  |  |  |  |  | December 2017 |  |  |  |
Light Era Development Co., Ltd. (LED) [Member] | Chang Hwa Bank Secured Loan [Member] | Due December 2014 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Secured loan |  |  |  |  |  |  |  |  |  | $ 300
Loan due date |  |  |  |  |  | December 2014 |  |  |  |
Light Era Development Co., Ltd. (LED) [Member] | Chang Hwa Bank Secured Loan [Member] | Due September 2015 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Secured loan |  |  |  |  |  |  |  |  |  | $ 1,350
Loan due date |  |  |  |  |  | September 2015 |  |  |  |
Chunghwa Precision Test Tech. Co., Ltd. (CHPT) [Member] | Bank of Taiwan Secured Loan [Member] | Due April 2029 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Secured loan |  |  |  |  |  |  |  | $ 348 |  |
Early repayment of secured loan | $ 50 |  |  | $ 150 | $ 148 |  |  |  |  |
Loan due date |  |  |  |  |  | April 2029 |  |  |  |

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