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Supplementary Cash Flow Information - Partial Cash Paid for Investing Activities (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Statement of cash flows [abstract]        
Purchase of property, plant and equipment $ 4,133,615   $ 4,896,656 $ 4,945,570
Add: Beginning balance of payable to contractors and equipment suppliers 972,770   1,516,735 713,313
Add :Beginning balance of payable on lease       29,842
Less: Ending balance of payable to contractors and equipment suppliers (1,145,359)   (972,770) (1,516,735)
Less:Ending balance of payable on lease       (17,792)
Cash paid during the year $ 3,961,026 $ 141,062 $ 5,440,621 $ 4,154,198