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Disposal of Subsidiaries - Summary of Gain on Disposal of Subsidiaries (Detail) - TWD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2017
Disclosure of gain from disposals of subsidiaries [line items]    
Total consideration   $ 7,046,464
Cash and cash equivalents $ 29,133  
Inventories related to real estate business 1,427,874  
Net assets disposed of 1,457,007  
Kun Shan Ding Yue Real Estate Development Co., Ltd. [member]    
Disclosure of gain from disposals of subsidiaries [line items]    
Total consideration 7,046,464  
Net assets disposed of (1,457,007)  
Gain on disposal of KSDY $ 5,589,457