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Lease Arrangements - Summary of Other Related Lease Information (Detail) - 12 months ended Dec. 31, 2019
$ in Thousands, $ in Thousands
TWD ($)
USD ($)
Disclosure of detailed information about property, plant and equipment [abstract]    
Expenses relating to short-term leases $ 421,924 $ 14,106
Expenses relating to low-value assets leases 4,473 150
Expenses relating to variable lease payments not included in the measurement of lease liabilities 53,403 1,785
Total cash outflow for leases $ (1,511,277) $ (50,527)