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Business Combinations - Summary of Goodwill Recognized on Acquisition of SPIL (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2018 TWD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 TWD ($)	Dec. 31, 2016 TWD ($)	Dec. 31, 2015 TWD ($)
Disclosure of detailed information about business combination [Line Items]
Goodwill recognized on acquisition	$ 1,632,618	$ 49,974,446	$ 324,551	$ 9,934,494	$ 10,490,309	$ 10,506,519
Siliconware Precision Industries Co., Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Total consideration	5,502,796	168,440,585
Add: Non-controlling interests	117,049	3,582,866
Less: Fair value of identifiable net assets acquired	(4,313,402)	(132,033,220)
Goodwill recognized on acquisition	$ 1,306,443	$ 39,990,231

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- Definition

The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]]

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The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

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The amount recognised as of the acquisition date for net identifiable assets acquired or liabilities assumed in a business combination. [Refer: Business combinations [member]]

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