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Non-current Assets Held for Sale and Discontinued Operations - Results of Discontinued Operations (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Noncurrent assets or disposal groups classified as held for sale or as held for distribution to owners [Line Items]        
Revenue $ 20,337,881 $ 679,969 $ 18,480,027 $ 17,940,855
Cost of revenue (16,411,742) (548,704) (15,050,032) (14,703,729)
Other operating income (expenses), net 92,928 3,107 147,514 692,834
Loss from discontinued operations after income tax (3,022,253) (101,045) (1,782,442) (1,532,416)
Profit (loss) from discontinued operations 1,814,953
Discontinued operations: Unimos Shanghai [member]        
Noncurrent assets or disposal groups classified as held for sale or as held for distribution to owners [Line Items]        
Revenue       227,095
Cost of revenue       (195,078)
Operating expenses       (58,840)
Other operating income (expenses), net       1,429
Non-operating income (expenses), net       (2,887)
Loss from discontinued operations after income tax       (28,281)
Income tax expense       0
Loss from discontinued operations after income tax       (28,281)
Gain on disposal of discontinued operations       1,843,234
Profit (loss) from discontinued operations       $ 1,814,953