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Disposal of Subsidiaries - Summary of Gain on Disposal of Subsidiaries (Detail)
$ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2017
TWD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Disclosure of gain from disposals of subsidiaries [Line Items]        
Total consideration     $ (7,046,464) $ (237,735)
KSDY [member]        
Disclosure of gain from disposals of subsidiaries [Line Items]        
Total consideration $ 7,046,464 $ 237,735    
Net assets disposed of (1,457,007) (49,157)    
Gain on disposal of KSDY $ 5,589,457 $ 188,578