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Investment Properties - Additional Information (Detail) - Dec. 31, 2017
$ in Thousands, $ in Thousands
TWD ($)
USD ($)
Disclosure of detailed information about investment property [line items]    
Fair value of investment properties $ 8,119,436 $ 273,935
Level 3 of fair value hierarchy [member] | Fair value [member]    
Disclosure of detailed information about investment property [line items]    
Fair value of investment properties $ 11,560,440 $ 390,028