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Investments Accounted for Using the Equity Method - Summary of Retrospective Adjustments (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Disclosure of associates and joint ventures [line items]      
Investments accounted for using the equity method $ 48,267,237 $ 1,628,449 $ 49,154,140
Deca Technologies Inc. [member]      
Disclosure of associates and joint ventures [line items]      
Investments accounted for using the equity method     1,813,677
Deca Technologies Inc. [member] | Previously stated [member]      
Disclosure of associates and joint ventures [line items]      
Investments accounted for using the equity method     1,820,329
Advanced Microelectronic Products Inc. [member]      
Disclosure of associates and joint ventures [line items]      
Investments accounted for using the equity method     264,434
Advanced Microelectronic Products Inc. [member] | Previously stated [member]      
Disclosure of associates and joint ventures [line items]      
Investments accounted for using the equity method     $ 266,085