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Non-cash Transactions - Summary of Non-cash Investing Activities (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Payments for property, plant and equipment |  |  |  |
Purchase of property, plant and equipment | $ 23,677,682 | $ 798,842 | $ 27,680,862 | $ 28,280,821
Increase (decrease) in prepayments for property, plant and equipment (recorded under the line item of other non-current assets) | 90,560 | 3,055 | (89,337) | (267,334)
(Increase) decrease in payables for property, plant and equipment (recorded under the line item of other payables) | 982,260 | 33,140 | (823,171) | 2,314,772
Capitalized borrowing costs | (51,262) | (1,729) | (54,191) | (48,135)
Payments for property, plant and equipment | 24,699,240 | 833,308 | 26,714,163 | 30,280,124
Proceeds from disposal of property, plant and equipment |  |  |  |
Consideration from disposal of property, plant and equipment | 1,487,334 | 50,180 | 692,826 | 201,766
(Increase) decrease in other receivables | 876 | 30 | (22,626) | 41,265
Proceeds from disposal of property, plant and equipment | 1,488,210 | 50,210 | 670,200 | 243,031
Payments for investment properties |  |  |  |
Purchase of investment properties | 186,535 | 6,293 |  |
Capitalized borrowing costs | (13) |  |  |
Proceeds from disposals of investment property | 186,522 | 6,293 |  |
Payments for other intangible assets |  |  |  |
Purchase of other intangible assets | 277,825 | 9,373 | 675,144 | 491,135
Decrease (increase) in other payables | 60,159 | 2,030 | (120,938) |
Increase in other non-current liabilities |  |  | (40,313) |
Purchase of intangible assets classified as investing activities | 337,984 | 11,403 | $ 513,893 | $ 491,135
Net cash inflow from disposal of subsidiaries |  |  |  |
Consideration from disposal of subsidiaries | 7,046,464 | 237,735 |  |
Increase in other payables | 3,552 | 120 |  |
Cash and cash equivalents disposed of | (29,133) | (983) |  |
Net cash inflow from disposal of subsidiaries | $ 7,020,883 | $ 236,872 |  |

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