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Supplementary Cash Flow Information - Partial Cash Paid for Investing and Financing Activities (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Statement of cash flows [abstract]        
Purchase of property, plant and equipment $ 4,896,656   $ 4,945,570 $ 4,849,331
Add: Beginning balance of payable to contractors and equipment suppliers 1,516,735   713,313 839,983
Add :Beginning balance of payable on lease     29,842 94,952
Less: Ending balance of payable to contractors and equipment suppliers (972,770)   (1,516,735) (878,065)
Less:Ending balance of payable on lease     (17,792) (84,192)
Less: Transfer from prepaid equipment (shown as "Other non-current assets")       (139,304)
Cash paid during the year $ 5,440,621 $ 181,900 $ 4,154,198 4,682,705
Disposal of a subsidiary       2,166,151
Add: Ending balance of other payables       64,393
Less: Cash and cash equivalents of discontinued operations       (449,331)
Cash received from disposal of a subsidiary       $ 1,781,213