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Operating Costs and Expenses - Summary of Operating Costs and Expenses (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Analysis of income and expense [abstract] |  |  |  |
Change of finished goods and work in process |  |  |  | $ 31,977
Raw materials and supplies used | $ 3,575,283 |  | $ 3,079,909 | 3,036,350
Employee benefit expenses | 6,075,773 |  | 5,606,833 | 5,895,778
Depreciation expenses | 3,731,914 |  | 3,376,579 | 2,899,278
Others | 4,590,720 |  | 4,464,499 | 4,530,425
Total operating costs and expenses | 17,973,690 |  | 16,527,820 | 16,393,808
Employee benefit expenses |  |  |  |
Salaries | 5,114,790 |  | 4,628,039 | 4,847,433
Director's remuneration | 26,266 |  | 18,456 | 27,276
Labor and health insurance | 422,106 |  | 406,111 | 390,788
Pension | 194,173 |  | 201,567 | 198,502
Share-based payments | 822 | $ 27 | 41,043 | 123,021
Other personnel expenses | 317,616 |  | 311,617 | 308,758
Total Employee benefit expenses | $ 6,075,773 |  | $ 5,606,833 | $ 5,895,778

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