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Consolidation of Subsidiary - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Nov. 20, 2015
OmniVision Technologies Inc [member] | VisEra Holding Company [member]
Disclosure of subsidiaries [line items]
Ownership in subsidiary			49.10%
OmniVision Technologies Inc [member] | OVT Taiwan [member]
Disclosure of subsidiaries [line items]
Ownership in subsidiary			100.00%
VisEra Holding Company [member]
Disclosure of subsidiaries [line items]
Ownership in subsidiary		49.10%
Net revenue of combined entity	$ 846,401.8
Net income of combined entity	$ 302,964.4

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- Definition

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 percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]]

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The revenue of the combined entity as though the acquisition date for all business combinations that occurred during the year had been as of the beginning of the annual reporting period. [Refer: Business combinations [member]; Revenue]

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