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Investments Accounted for Using the Equity Method - Summary of Aggregate Information of Associates that are Not Individually Material (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Disclosure of associates and joint ventures [line items]        
Net profit (loss) for the year $ 24,497,060 $ 826,487 $ 22,577,861 $ 20,700,715
Other comprehensive income (loss) for the year (4,637,933) (156,475) (7,959,259) (147,547)
Total comprehensive income (loss) for the year 19,859,127 670,012 14,618,602 20,553,168
Associates that are not individually material [member]        
Disclosure of associates and joint ventures [line items]        
Net profit (loss) for the year (190,532) (6,428) (139,366) 120,749
Other comprehensive income (loss) for the year 59,676 2,013 (115,650) (2,916)
Total comprehensive income (loss) for the year $ (130,856) $ (4,415) $ (255,016) $ 117,833