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Guarantee Deposits - Summary of Guarantee Deposits (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Guarantee deposits [abstract]      
Capacity guarantee $ 9,289.6   $ 13,346.6
Receivables guarantee 653.7   2,427.5
Others 245.7   306.5
Guarantee deposits 10,189.0   16,080.6
Current portion (classified under accrued expenses and other current liabilities) 6,835.7   8,493.8
Noncurrent portion 3,353.3 $ 109.6 7,586.8
Guarantee deposits $ 10,189.0   $ 16,080.6