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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 ($) | TWD ($)
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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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