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Non-current Assets Held for Sale and Discontinued Operations - Additional Information (Detail)
$ in Thousands
 1 Months Ended
Mar. 31, 2017
TWD ($)
Noncurrent assets or disposal groups classified as held for sale or as held for distribution to owners [Line Items]  
Cash consideration $ 2,230,544
Gain on disposal of discontinued operation $ 1,843,234
Percentage of disposal of equity interest 54.98%
Fair value of gain on disposal of equity interest $ 999,630
Percentage of fair value gain on remeasurement of retained investment 45.02%
Fair value of gain on remeasurement of retained investment $ 843,604
Unimos Shanghai [member]  
Noncurrent assets or disposal groups classified as held for sale or as held for distribution to owners [Line Items]  
Equity interest in subsidiary to be sold 54.98%