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Profit Before Income Tax - Summary of Depreciation and Amortization (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Analysis of income and expense [Line Items] |  |  |  |
Property, plant and equipment depreciation | $ 28,747,518 | $ 969,890 | $ 28,961,614 | $ 28,938,770
Investment properties | 122,231 | 4,124 |  |
Intangible assets amortization | 457,666 | 15,441 | 508,823 | 579,894
Depreciation and amortization | 29,205,184 | 985,331 | 29,470,437 | 29,518,664
Operating costs [member] |  |  |  |
Analysis of income and expense [Line Items] |  |  |  |
Property, plant and equipment depreciation | 26,731,714 | 901,880 | 26,948,106 | 27,023,957
Intangible assets amortization | 140,175 | 4,729 | 152,987 | 124,235
Operating expenses [member] |  |  |  |
Analysis of income and expense [Line Items] |  |  |  |
Property, plant and equipment depreciation | 2,015,804 | 68,010 | 2,013,508 | 1,914,813
Intangible assets amortization | $ 317,491 | $ 10,712 | $ 355,836 | $ 455,659

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