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Business Combinations - Summary of Acquisition of SPIL (Detail) - Siliconware Precision Industries Co., Ltd. [member] $ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | May 31, 2018
Disclosure of detailed information about business combination [Line Items] |  |  |
Principal Activity | Engaged in the assembly, testing and turnkey services of integrated circuits. |  |
Date of Acquisition | Apr. 30, 2018 |  |
Proportion of Voting Equity Interests Acquired | 100.00% | 100.00% | 100.00%
Consideration Transferred | $ 5,502,796 | $ 168,440,585 |

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