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Equity - Summary of Non-controlling Interests (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
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
Share of profit for the year (Note 28) | 1,677,941 | $ 56,611 | 1,253,438 | 968,567
Exchange difference on translating foreign operations | (5,287,734) | (178,399) | (6,445,643) | (63,509)
Unrealized gain on available-for-sale financial assets | 224,036 | 7,559 | (248,599) | 10,451
Defined benefit plan actuarial gains (losses) | 205,344 | 6,928 | (417,181) | (62,911)
Ending balance | 201,310,187 | 6,791,842 | 166,841,165 | 165,924,980
Non-controlling interests [member] |  |  |  |
Beginning balance | 12,000,551 | 404,877 | 11,492,545 | 8,209,860
Share of profit for the year (Note 28) | 1,677,941 | 56,611 | 1,253,438 | 968,567
Exchange difference on translating foreign operations | (334,920) | (11,300) | (601,787) | (74,968)
Unrealized gain on available-for-sale financial assets | 5,763 | 194 | 1,129 | 3,928
Defined benefit plan actuarial gains (losses) | (13,724) | (463) | 8,846 | (3,440)
Non-controlling interests arising from acquisition of subsidiaries (Note 28) |  |  | 42,857 |
Partial disposal of subsidiaries (Note 30) | (3,055) | (103) | 26,436 | 1,712,836
Repurchase of outstanding ordinary shares of subsidiaries (Note 30) |  |  | (912,886) |
Spin-off of subsidiaries |  |  |  | 3,006
Non-controlling interest relating to outstanding vested employee share options held by the employees of subsidiaries | 263,213 | 8,880 | 927,823 | 904,904
Non-controlling interest relating to outstanding expired employee share options | (159,200) | (5,371) |  |
Cash dividends to non-controlling interests | (246,440) | (8,314) | (237,850) | (232,148)
Ending balance | $ 13,190,129 | $ 445,011 | $ 12,000,551 | $ 11,492,545

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