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Guarantee Deposits - Summary of Guarantee Deposits (Detail)
$ in Millions, $ in Millions
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Guarantee deposits [abstract]      
Capacity guarantee $ 1,499.4   $ 9,289.6
Receivables guarantee     653.7
Others 230.5   245.7
Guarantee deposits 1,729.9   10,189.0
Current portion (classified under accrued expenses and other current liabilities) 1,553.0   6,835.7
Noncurrent portion 176.9 $ 5.9 3,353.3
Guarantee deposits $ 1,729.9   $ 10,189.0