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Equity - Summary of Non-controlling Interests (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2018 TWD ($)
Share of profit for the year | $ 39,320 | $ 1,203,588 | $ 1,677,941 | $ 1,253,438 |
Balance at January 1 |  | 201,310,187 | 166,841,165 | 165,924,980 |
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |
Exchange difference on translating foreign operations | 7,443 | 227,821 | (5,287,734) | (6,445,643) |
Unrealized gain on available-for-sale financial assets |  |  | 224,036 | (248,599) |
Balance at December 31 | 7,155,436 | 219,027,922 | 201,310,187 | 166,841,165 |
Non-controlling interests [member] |  |  |  |  |
Share of profit for the year | 39,341 | 1,204,217 | 1,677,941 | 1,253,438 |
Balance at January 1 |  | 13,190,129 | 12,000,551 | 11,492,545 |
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |
Exchange difference on translating foreign operations | (6,480) | (198,365) | (334,920) | (601,787) |
Unrealized gain on available-for-sale financial assets |  |  | 5,763 | 1,129 |
Unrealized loss on equity instruments at FVTOCI | (782) | (23,928) |  |  |
Remeasurement on defined benefit plans | (983) | (30,079) | (13,724) | 8,846 |
Non-controlling interests arising from acquisition of subsidiaries (Note 30) | 117,049 | 3,582,866 |  |  |
Acquisition of non-controlling interests in subsidiaries | (81,441) | (2,492,915) |  | 42,857 |
Partial disposal of subsidiaries (Note 32) | 55,311 | 1,693,064 | (3,055) | 26,436 |
Subsidiaries' buy back of their own outstanding ordinary shares (Note 32) | (26,197) | (801,884) |  | (912,886) |
Non-controlling interest relating to outstanding vested employee share options granted by subsidiaries | 63,268 | 1,936,643 | 263,213 | 927,823 |
Non-controlling interest relating to outstanding expired employee share options granted by subsidiaries |  |  | (159,200) |  |
Cash dividends to non-controlling interests | (13,878) | (424,815) | (246,440) | (237,850) |
Balance at December 31 | 576,265 | 17,639,487 | 13,190,129 | 12,000,551 |
Non-controlling interests [member] | Pre IFRS 15 [member] |  |  |  |  |
Balance at January 1 | 430,909 | 13,190,129 | 12,000,551 | 11,492,545 |
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |
Balance at December 31 |  |  | 13,190,129 | 12,000,551 |
Non-controlling interests [member] | Adjustments arising from initial application [member] |  |  |  |  |
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |
Adjustment on initial application of IFRS 15 (Note 3) | 169 |  |  |  | $ 5,183
Non-controlling interests [member] | Adoption of IFRS 15 [member] |  |  |  |  |
Balance at January 1 | $ 431,078 | $ 13,195,312 | 12,000,551 | 11,492,545 |
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |
Balance at December 31 |  |  | $ 13,195,312 | $ 12,000,551 |

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