XML 169 R150.htm IDEA: XBRL DOCUMENT v3.19.1
Equity - Summary of Unrealized Gain (Loss) on Available-for-sale Financial Assets (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Balance at January 1   $ 201,310,187 $ 166,841,165 $ 165,924,980
Unrealized gain (loss) arising on revaluation of available-for-sale financial assets     224,036 (248,599)
Share from associates and joint venture accounted for using the equity method $ 4,463 136,608 264,389 (871,679)
Balance at December 31 $ 7,155,436 219,027,922 201,310,187 166,841,165
Reserve of gains and losses on remeasuring available-for-sale financial assets excluding changes in capital surplus [member]        
Balance at January 1   $ 422,570 (197,314) 588,119
Unrealized gain (loss) arising on revaluation of available-for-sale financial assets     169,585 (257,240)
Cumulative loss reclassified to profit or loss on impairment of available-for-sale financial assets     50,206  
Cumulative loss (gain) reclassified to profit or loss on disposal of available-for-sale financial assets     (1,517) 7,512
Share from associates and joint venture accounted for using the equity method     401,610 (535,705)
Balance at December 31     $ 422,570 $ (197,314)