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Equity - Summary of Unrealized Gain (Loss) on Available-for-sale Financial 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 ($) | Dec. 31, 2015 TWD ($)
Beginning balance | $ 166,841,165 |  | $ 165,924,980 | $ 155,691,394
Unrealized gain (loss) arising on revaluation of available-for-sale financial assets | 224,036 | $ 7,559 | (248,599) | 10,451
Share of unrealized gain (loss) on available-for-sale financial assets 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
Reserve of gains and losses on remeasuring available-for-sale financial assets excluding changes in capital surplus [member] |  |  |  |
Beginning balance | (197,314) | (6,657) | 588,119 | 526,778
Unrealized gain (loss) arising on revaluation of available-for-sale financial assets | 169,585 | 5,721 | (257,240) | (4,304)
Cumulative loss reclassified to profit or loss on impairment of available-for-sale financial assets | 50,206 | 1,694 |  |
Cumulative loss (gain) reclassified to profit or loss on disposal of available-for-sale financial assets | (1,517) | (51) | 7,512 | 10,827
Share of unrealized gain (loss) on available-for-sale financial assets of associates and joint venture accounted for using the equity method | 401,610 | 13,550 | (535,705) | 54,818
Ending balance | $ 422,570 | $ 14,257 | $ (197,314) | $ 588,119

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