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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
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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

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