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Cash Flows Information - Summary of Non-cash Investing Activities (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Payments for property, plant and equipment        
Purchase of property, plant and equipment $ 63,073,887 $ 2,108,789 $ 39,092,238 $ 23,677,682
Increase in other non-current assets 68,560 2,292 402,255 90,560
Decrease (increase) in other payables (6,254,579) (209,113) 1,942,259 982,260
Capitalized borrowing costs (77,715) (2,598) (50,309) (51,262)
Payments for property, plant and equipment 56,810,153 1,899,370 41,386,443 24,699,240
Proceeds from disposal of property, plant and equipment        
Consideration from disposal of property, plant and equipment 441,444 14,759 1,133,435 1,487,334
Decrease (increase) in other receivables 7,495 251 (5,791) 876
Proceeds from disposal of property, plant and equipment 448,939 15,010 1,127,644 1,488,210
Payments for investment properties        
Purchase of investment properties 2,532 85 125,853 186,535
Capitalized borrowing costs     (89) (13)
Proceeds from disposals of investment property 2,532 85 125,764 186,522
Payments for other intangible assets        
Purchase of other intangible assets 1,350,908 45,166 537,659 277,825
Decrease (increase) in other payables 60,160 2,011 40,106 60,159
Purchase of intangible assets classified as investing activities $ 1,411,068 $ 47,177 $ 577,765 337,984
Net cash inflow from disposal of subsidiaries        
Consideration from disposal of subsidiaries       7,046,464
Increase in other payables       3,552
Cash and cash equivalents disposed of       (29,133)
Net cash inflow from disposal of subsidiaries       $ 7,020,883