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Property, Plant and Equipment - Summary of Property, Plant and Equipment (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 property, plant and equipment [Line Items] |  |  |  |
Beginning balance | $ 143,880,241 |  |  |
Depreciation expense | 28,747,518 | $ 969,890 | $ 28,961,614 | $ 28,938,770
Additions | 23,677,682 | 798,842 | 27,680,862 | 28,280,821
Ending balance | 135,168,406 | 4,560,338 | 143,880,241 |
Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 364,012,147 | 12,281,112 | 355,233,007 | 336,787,690
Additions | 23,677,682 | 798,842 | 27,680,862 | 28,280,821
Disposals | (9,896,428) | (333,887) | (7,069,481) | (8,700,239)
Reclassification | (474,352) | (16,003) | (175) | 130,809
Acquisitions through business combinations |  |  | 1,159 |
Effect of foreign currency exchange differences | (6,998,807) | (236,128) | (11,833,225) | (1,266,074)
Ending balance | 370,320,242 | 12,493,936 | 364,012,147 | 355,233,007
Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 220,131,906 | 7,426,852 | 205,235,932 | 185,200,575
Depreciation expense | 28,625,287 | 965,766 | 28,961,614 | 28,938,770
Impairment losses recognized | 289,558 | 9,769 | 888,231 | 258,129
Disposals | (8,757,164) | (295,450) | (6,245,611) | (8,372,341)
Reclassification | (199,745) | (6,740) |  | (3,208)
Acquisitions through business combinations |  |  | 824 |
Effect of foreign currency exchange differences | (4,938,006) | (166,599) | (8,709,084) | (785,993)
Ending balance | 235,151,836 | 7,933,598 | 220,131,906 | 205,235,932
Land [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 3,365,013 |  |  |
Ending balance | 3,258,518 | 109,937 | 3,365,013 |
Land [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 3,365,013 | 113,529 | 3,381,300 | 3,348,018
Reclassification | (35,965) | (1,212) |  |
Effect of foreign currency exchange differences | (70,530) | (2,380) | (16,287) | 33,282
Ending balance | 3,258,518 | 109,937 | 3,365,013 | 3,381,300
Buildings and improvements [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 58,028,631 |  |  |
Ending balance | 58,272,864 | 1,966,021 | 58,028,631 |
Buildings and improvements [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 96,258,175 | 3,247,577 | 94,447,932 | 86,725,254
Additions | 350,434 | 11,823 | 22,341 | 132,584
Disposals | (609,294) | (20,556) | (684,698) | (405,040)
Reclassification | 6,483,392 | 218,738 | 5,110,102 | 8,579,472
Effect of foreign currency exchange differences | (2,294,779) | (77,422) | (2,637,502) | (584,338)
Ending balance | 100,187,928 | 3,380,160 | 96,258,175 | 94,447,932
Buildings and improvements [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 38,229,544 | 1,289,796 | 34,646,878 | 30,329,544
Depreciation expense | 5,156,558 | 173,973 | 5,114,263 | 4,790,646
Impairment losses recognized | 2,310 | 78 | 620 | 120,424
Disposals | (478,903) | (16,157) | (449,198) | (308,895)
Reclassification | (210,080) | (7,088) | (5,123) | 5,704
Effect of foreign currency exchange differences | (784,365) | (26,463) | (1,077,896) | (290,545)
Ending balance | 41,915,064 | 1,414,139 | 38,229,544 | 34,646,878
Machinery and equipment1 [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 72,700,762 |  |  |
Ending balance | 66,185,198 | 2,232,969 | 72,700,762 |
Machinery and equipment1 [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 248,200,756 | 8,373,845 | 243,283,607 | 233,669,627
Additions | 102,301 | 3,451 | 94,480 | 553,496
Disposals | (8,449,949) | (285,086) | (5,956,179) | (8,041,933)
Reclassification | 18,331,738 | 618,480 | 19,661,732 | 18,054,712
Effect of foreign currency exchange differences | (4,986,843) | (168,247) | (8,882,884) | (952,295)
Ending balance | 253,198,003 | 8,542,443 | 248,200,756 | 243,283,607
Machinery and equipment1 [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 175,499,994 | 5,921,052 | 164,568,298 | 149,497,980
Depreciation expense | 22,722,307 | 766,610 | 22,983,290 | 23,372,408
Impairment losses recognized | 286,880 | 9,679 | 876,123 | 31,116
Disposals | (7,540,654) | (254,408) | (5,544,489) | (7,838,937)
Reclassification | 34,452 | 1,162 | 9,660 | (11,920)
Effect of foreign currency exchange differences | (3,990,174) | (134,621) | (7,392,888) | (482,349)
Ending balance | 187,012,805 | 6,309,474 | 175,499,994 | 164,568,298
Other equipment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 2,089,581 |  |  |
Ending balance | 1,588,113 | 53,580 | 2,089,581 |
Other equipment [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 8,474,661 | 285,920 | 7,722,408 | 7,182,574
Additions | 130,659 | 4,408 | 470,901 | 401,417
Disposals | (763,937) | (25,774) | (159,822) | (232,555)
Reclassification | 174,947 | 5,902 | 691,276 | 389,783
Acquisitions through business combinations |  |  | 1,159 |
Effect of foreign currency exchange differences | (204,250) | (6,891) | (251,261) | (18,811)
Ending balance | 7,812,080 | 263,565 | 8,474,661 | 7,722,408
Other equipment [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 6,385,080 | 215,421 | 5,907,414 | 5,365,887
Depreciation expense | 746,422 | 25,183 | 864,061 | 775,716
Impairment losses recognized | 368 | 12 | 5,564 |
Disposals | (720,319) | (24,302) | (151,875) | (224,509)
Reclassification | (24,117) | (814) | (4,537) | 3,008
Acquisitions through business combinations |  |  | 824 |
Effect of foreign currency exchange differences | (163,467) | (5,515) | (236,371) | (12,688)
Ending balance | 6,223,967 | 209,985 | 6,385,080 | 5,907,414
Construction in progress and machinery in transit [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 7,696,254 |  |  |
Ending balance | 5,863,713 | 197,831 | 7,696,254 |
Construction in progress and machinery in transit [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 7,713,542 | 260,241 | 6,397,760 | 5,862,217
Additions | 23,094,288 | 779,160 | 27,093,140 | 27,193,324
Disposals | (73,248) | (2,471) | (268,782) | (20,711)
Reclassification | (25,428,464) | (857,911) | (25,463,285) | (26,893,158)
Effect of foreign currency exchange differences | 557,595 | 18,812 | (45,291) | 256,088
Ending balance | 5,863,713 | 197,831 | 7,713,542 | 6,397,760
Construction in progress and machinery in transit [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 17,288 | 583 | 113,342 | 7,164
Impairment losses recognized |  |  | 5,924 | 106,589
Disposals | $ (17,288) | $ (583) | (100,049) |
Effect of foreign currency exchange differences |  |  | (1,929) | (411)
Ending balance |  |  | $ 17,288 | $ 113,342

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