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Financial Instruments - Summary of Fair Value of Financial Instruments that are Measured at Fair Value on a Recurring Basis (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Disclosure of detailed information about financial instruments [line items]      
Financial assets designated as at FVTPL $ 100,496 $ 3,391 $ 100,583
Financial assets held for trading 5,122,571 172,826 2,969,229
Financial liabilities at FVTPL 677,430 22,855 1,763,660
Financial assets at fair value through profit or loss 5,223,067 176,217 3,069,812
Available-for-sale financial assets 1,212,165 40,896 1,295,034
Level 1 of fair value hierarchy [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value through profit or loss 5,000,708 168,715 2,440,018
Available-for-sale financial assets 303,616 10,244 390,244
Level 2 of fair value hierarchy [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at FVTPL 677,430 22,855 1,763,660
Financial assets at fair value through profit or loss 222,359 7,502 629,794
Level 3 of fair value hierarchy [member]      
Disclosure of detailed information about financial instruments [line items]      
Available-for-sale financial assets 908,549 30,652 904,790
Private-placement convertible bonds [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets designated as at FVTPL 100,496 3,391 100,583
Private-placement convertible bonds [member] | Level 2 of fair value hierarchy [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets designated as at FVTPL 100,496 3,391 100,583
Forward exchange contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets held for trading 61,325 2,069 462,339
Financial liabilities at FVTPL 25,323 854 108,912
Forward exchange contracts [member] | Level 2 of fair value hierarchy [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets held for trading 61,325 2,069 462,339
Financial liabilities at FVTPL 25,323 854 108,912
Swap contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets held for trading 60,538 2,042 462,339
Financial liabilities at FVTPL 652,107 22,001 422,934
Swap contracts [member] | Level 2 of fair value hierarchy [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets held for trading 60,538 2,042  
Financial liabilities at FVTPL 652,107 22,001 422,934
Quoted shares [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets held for trading 4,410,732 148,810 1,855,073
Quoted shares [member] | Level 1 of fair value hierarchy [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets held for trading 4,410,732 148,810 1,855,073
Open-end mutual funds [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets held for trading 589,976 19,905 584,945
Available-for-sale financial assets 23,825 804 243,458
Open-end mutual funds [member] | Level 1 of fair value hierarchy [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets held for trading 589,976 19,905 584,945
Available-for-sale financial assets 23,825 804 243,458
Unquoted shares [Member]      
Disclosure of detailed information about financial instruments [line items]      
Available-for-sale financial assets 662,477 22,350 631,418
Unquoted shares [Member] | Level 3 of fair value hierarchy [member]      
Disclosure of detailed information about financial instruments [line items]      
Available-for-sale financial assets 662,477 22,350 631,418
Limited partnership [member]      
Disclosure of detailed information about financial instruments [line items]      
Available-for-sale financial assets 246,072 8,302 273,372
Limited partnership [member] | Level 3 of fair value hierarchy [member]      
Disclosure of detailed information about financial instruments [line items]      
Available-for-sale financial assets 246,072 8,302 273,372
Quoted ordinary shares [member]      
Disclosure of detailed information about financial instruments [line items]      
Available-for-sale financial assets 279,791 9,440 146,786
Quoted ordinary shares [member] | Level 1 of fair value hierarchy [member]      
Disclosure of detailed information about financial instruments [line items]      
Available-for-sale financial assets $ 279,791 $ 9,440 146,786
Foreign currency option contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets held for trading     66,872
Financial liabilities at FVTPL     17,924
Foreign currency option contracts [member] | Level 2 of fair value hierarchy [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets held for trading     66,872
Financial liabilities at FVTPL     17,924
Conversion option, redemption option and put option of convertible bonds [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at FVTPL     1,213,890
Conversion option, redemption option and put option of convertible bonds [member] | Level 2 of fair value hierarchy [Member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities at FVTPL     $ 1,213,890