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Business Combinations - Summary of Impact of Acquisitions by Comprehensive Income (Detail) - 12 months ended Dec. 31, 2018 - Siliconware Precision Industries Co., Ltd. [member] $ in Thousands, $ in Thousands	USD ($)	TWD ($)
Disclosure of detailed information about business combination [Line Items]
Operating revenue	$ 2,000,906	$ 61,247,727
Profit	$ 249,179	$ 7,627,382

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The profit (loss) of the acquiree, since the acquisition date, included in the consolidated statement of comprehensive income. [Refer: Profit (loss)]

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The amount of revenue of the acquiree since the acquisition date included in the consolidated statement of comprehensive income. [Refer: Revenue]

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