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Equity - Summary of Non-controlling Interests (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Share of profit for the year | $ 1,207,974 | $ 40,387 | $ 1,203,588 | $ 1,677,941
Balance at January 1 | 219,027,922 |  | 201,310,187 | 166,841,165
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |
Exchange difference on translating foreign operations | (5,202,145) | (173,927) | 227,821 | (5,287,734)
Unrealized gain on available-for-sale financial assets |  |  |  | 224,036
Balance at December 31 | 212,802,312 | 7,114,755 | 219,027,922 | 201,310,187
Non-controlling interests [member] |  |  |  |
Share of profit for the year | 1,207,974 | 40,387 | 1,203,588 | 1,677,941
Balance at January 1 | 17,639,487 |  | 13,190,129 | 12,000,551
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |
Exchange difference on translating foreign operations | (414,010) | (13,842) | (198,365) | (334,920)
Unrealized gain on available-for-sale financial assets |  |  |  | 5,763
Unrealized loss on equity instruments at FVTOCI | (10,773) | (360) | (23,928) |
Remeasurement on defined benefit plans | (7,422) | (248) | (30,079) | (13,724)
Non-controlling interests arising from acquisition of subsidiaries (Note 30) | 666,651 | 22,289 | 3,582,866 |
Subscribing for ordinary shares form subsidiaries' cash capital increase | 83,044 | 2,776 |  |
Acquisition of non-controlling interests in subsidiaries | (5,084,785) | (170,003) | (2,492,915) |
Partial disposal of subsidiaries (Note 32) |  |  | 1,693,064 | (3,055)
Subsidiaries' buy back of their own outstanding ordinary shares (Note 32) | (2,017,319) | (67,446) | (801,884) |
Non-controlling interest relating to outstanding vested employee share options granted by subsidiaries | 1,672,310 | 55,911 | 1,936,643 | 263,213
Non-controlling interest relating to outstanding expired employee share options granted by subsidiaries |  |  |  | (159,200)
Cash dividends to non-controlling interests | (360,245) | (12,044) | (424,815) | (246,440)
Balance at December 31 | 13,374,912 | 447,172 | 17,639,487 | 13,190,129
Non-controlling interests [member] | Pre IFRS 15 [member] |  |  |  |
Balance at January 1 | 17,639,487 | 589,752 | 13,190,129 | 12,000,551
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |
Balance at December 31 |  |  | 17,639,487 | 13,190,129
Non-controlling interests [member] | Adjustments arising from initial application [member] |  |  |  |
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |
Adjustment on initial application of IFRS 15 (Note 3) |  |  | 5,183 |
Non-controlling interests [member] | Adoption of IFRS 15 [member] |  |  |  |
Balance at January 1 | $ 17,639,487 | $ 589,752 | 13,195,312 | 12,000,551
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |
Balance at December 31 |  |  | $ 17,639,487 | $ 13,195,312

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