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Inventories - Summary of Inventories (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Classes of current inventories [abstract]      
Finished goods $ 6,740,816 $ 227,423 $ 6,519,465
Work in process 3,452,332 116,475 2,822,687
Raw materials 12,625,502 425,962 10,850,062
Supplies 894,196 30,168 795,093
Raw materials and supplies in transit 548,065 18,491 450,755
Inventories $ 24,260,911 $ 818,519 $ 21,438,062