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Equity - Summary of Exchange Differences on Translating Foreign Operations (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Beginning balance | $ 166,841,165 |  | $ 165,924,980 | $ 155,691,394
Exchange differences arising on translating foreign operations | (5,287,734) | $ (178,399) | (6,445,643) | (63,509)
Share of exchange difference of associates and joint venture accounted for using the equity method | 264,389 | 8,920 | (871,679) | (4,832)
Ending balance | 201,310,187 | 6,791,842 | 166,841,165 | 165,924,980
Exchange differences on translating foreign operations [member] |  |  |  |
Beginning balance | (1,643,623) | (55,453) | 4,492,671 | 4,540,862
Exchange differences arising on translating foreign operations | (4,952,815) | (167,099) | (5,843,856) | 11,459
Share of exchange difference of associates and joint venture accounted for using the equity method | (137,221) | (4,630) | (292,438) | (59,650)
Ending balance | $ (6,733,659) | $ (227,182) | $ (1,643,623) | $ 4,492,671

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