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Investments Accounted for Using Equity Method - Summarized Financial Information of Aggregated Individually Immaterial Associates (Detail) - Aggregated individually immaterial associates [member] - TWD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Disclosure of associates [line items]    
The Company's share of profits (losses) of associates $ 22.5 $ (154.2)
The Company's share of other comprehensive income (loss) of associates (5.2) 7.9
The Company's share of total comprehensive income (loss) of associates $ 17.3 $ (146.3)