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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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