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Other Intangible Assets - Summary of Carrying Amounts of Each Class of Other Intangible Assets (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Disclosure of detailed information about intangible assets [line items]        
Beginning balance $ 1,617,261      
Additions 277,825 $ 9,373 $ 675,144 $ 491,135
Amortization expense 457,666 15,441 508,823 579,894
Ending balance 1,406,865 47,465 1,617,261  
Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 5,174,700 174,585 4,601,416 6,785,494
Additions 277,825 9,373 675,144 491,135
Disposals (212,317) (7,163) (122,946) (2,655,923)
Reclassification     786 12,360
Acquisitions through business combinations     105,509  
Effect of foreign currency exchange differences (49,880) (1,684) (85,209) (31,650)
Ending balance 5,190,328 175,111 5,174,700 4,601,416
Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 3,557,439 120,020 3,219,323 5,317,623
Amortization expense 457,666 15,441 508,823 579,894
Disposals (196,224) (6,620) (101,174) (2,654,695)
Reclassification     786 3,190
Acquisitions through business combinations     506  
Effect of foreign currency exchange differences (35,418) (1,195) (70,825) (26,689)
Ending balance 3,783,463 127,646 3,557,439 3,219,323
Customer relationships [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 194,089      
Ending balance 113,776 3,839 194,089  
Customer relationships [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 915,636 30,892 915,636 1,579,015
Disposals     (41,099) (663,379)
Acquisitions through business combinations     41,099  
Ending balance 915,636 30,892 915,636 915,636
Customer relationships [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 721,547 24,343 641,234 1,077,514
Amortization expense 80,313 2,710 121,412 227,099
Disposals     (41,099) (663,379)
Ending balance 801,860 27,053 721,547 641,234
Computer software [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 943,527      
Ending balance 864,331 29,161 943,527  
Computer software [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 3,552,229 119,846 3,338,360 2,882,932
Additions 265,497 8,957 372,188 481,412
Disposals (83,595) (2,820) (80,537) (8,426)
Reclassification       12,360
Effect of foreign currency exchange differences (47,679) (1,609) (77,782) (29,918)
Ending balance 3,686,452 124,374 3,552,229 3,338,360
Computer software [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 2,608,702 88,012 2,385,038 2,084,805
Amortization expense 316,580 10,681 345,836 325,856
Disposals (72,481) (2,445) (58,765) (7,402)
Reclassification       3,190
Effect of foreign currency exchange differences (30,680) (1,035) (63,407) (21,411)
Ending balance 2,822,121 95,213 2,608,702 2,385,038
Patents and acquired specific technology [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 359,227      
Ending balance 319,402 10,776 359,227  
Patents and acquired specific technology [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 514,443 17,356 154,082 2,139,138
Additions     301,351 209
Disposals (123,744) (4,175) (1,310) (1,983,914)
Reclassification     786  
Acquisitions through business combinations     64,380  
Effect of foreign currency exchange differences (1,213) (41) (4,846) (1,351)
Ending balance 389,486 13,140 514,443 154,082
Patents and acquired specific technology [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 155,216 5,237 138,386 2,118,254
Amortization expense 43,493 1,467 24,154 9,461
Disposals (123,743) (4,175) (1,310) (1,983,914)
Reclassification     786  
Acquisitions through business combinations     483  
Effect of foreign currency exchange differences (4,882) (165) (7,283) (5,415)
Ending balance 70,084 2,364 155,216 138,386
Others [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 120,418      
Ending balance 109,356 3,689 120,418  
Others [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 192,392 6,491 193,338 184,409
Additions 12,328 416 1,605 9,514
Disposals (4,978) (168)   (204)
Acquisitions through business combinations     30  
Effect of foreign currency exchange differences (988) (34) (2,581) (381)
Ending balance 198,754 6,705 192,392 193,338
Others [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 71,974 2,428 54,665 37,050
Amortization expense 17,280 583 17,421 17,478
Acquisitions through business combinations     23  
Effect of foreign currency exchange differences 144 5 (135) 137
Ending balance $ 89,398 $ 3,016 $ 71,974 $ 54,665