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Profit Before Income Tax - Summary of Employees' Compensation and Remuneration to Directors (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Analysis of income and expense [Line Items] |  |  |  |
Employees' compensation | $ 2,291,140 | $ 77,299 | $ 2,147,323 | $ 2,033,500
Remuneration to directors | $ 208,285 | $ 7,027 | 195,211 | 184,500
Resolved by the board of directors [member] |  |  |  |
Analysis of income and expense [Line Items] |  |  |  |
Employees' compensation |  |  | 2,151,900 | 2,033,800
Remuneration to directors |  |  | $ 148,000 | $ 140,000

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