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Segment Information - Financial Segment Information for Operating Segments (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Revenue        
Revenue $ 22,695,909 $ 692,159 $ 21,356,228 $ 23,517,064
Operating profit (loss) 1,273,937 38,851 1,908,452 3,216,679
Depreciation expenses (4,856,186)   (4,779,333) (4,751,902)
Share of profit of associates 2,683 82 219,891 453,715
Interest income 197,719 $ 6,030 193,189 57,199
Interest expense (278,581)   (265,957) (142,439)
Purchase of property, plant and equipment 5,451,431   3,228,471 4,918,482
External [member]        
Revenue        
Revenue 22,695,909   21,356,228 23,517,064
Operating segments [member] | Testing [member]        
Revenue        
Revenue 4,967,849   4,394,726 5,243,997
Operating profit (loss) 625,435   514,707 1,253,477
Depreciation expenses (1,075,612)   (1,065,689) (1,042,455)
Purchase of property, plant and equipment 1,555,415   749,158 1,086,682
Operating segments [member] | Testing [member] | External [member]        
Revenue        
Revenue 4,967,849   4,394,726 5,243,997
Operating segments [member] | Assembly [member]        
Revenue        
Revenue 5,390,447   4,629,430 6,705,898
Operating profit (loss) (1,190,575)   (1,180,481) (93,585)
Depreciation expenses (799,273)   (722,462) (694,835)
Purchase of property, plant and equipment 1,273,837   568,289 957,790
Operating segments [member] | Assembly [member] | External [member]        
Revenue        
Revenue 5,390,447   4,629,430 6,705,898
Operating segments [member] | LCDD [member]        
Revenue        
Revenue 7,318,997   7,821,640 7,288,642
Operating profit (loss) 1,281,862   2,058,285 1,795,741
Depreciation expenses (2,568,610)   (2,547,253) (2,505,297)
Purchase of property, plant and equipment 2,257,968   1,756,590 2,677,489
Operating segments [member] | LCDD [member] | External [member]        
Revenue        
Revenue 7,318,997   7,821,640 7,288,642
Operating segments [member] | Bumping [member]        
Revenue        
Revenue 5,018,616   4,510,432 4,278,527
Operating profit (loss) 555,419   522,386 268,159
Depreciation expenses (405,330)   (435,709) (500,863)
Purchase of property, plant and equipment 364,139   152,908 196,521
Operating segments [member] | Bumping [member] | External [member]        
Revenue        
Revenue 5,018,616   4,510,432 4,278,527
Operating segments [member] | Others [member]        
Revenue        
Revenue 60,131   59,481 50,600
Operating profit (loss) 1,863   (6,194) (6,821)
Depreciation expenses (7,361)   (8,220) (8,452)
Share of profit of associates 119,118   420,393 884,555
Interest income 197,719   193,189 57,199
Interest expense (278,581)   (265,957) (142,439)
Purchase of property, plant and equipment 72   1,526 0
Operating segments [member] | Others [member] | Intersegment [member]        
Revenue        
Revenue 60,131   59,481 50,600
Elimination [member]        
Revenue        
Revenue (60,131)   (59,481) (50,600)
Operating profit (loss) (67)   (251) (292)
Share of profit of associates (116,435)   (200,502) (430,840)
Elimination [member] | Intersegment [member]        
Revenue        
Revenue $ (60,131)   $ (59,481) $ (50,600)