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Financial Instruments - Summary of Financial Assets Measured at Level 3 Fair Value (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Disclosure of fair value measurement of assets [line items] |  |  |  |
Beginning Balance | $ 357,930,576 |  | $ 364,986,892 |
Ending Balance | 363,922,272 | $ 12,278,079 | 357,930,576 | $ 364,986,892
Level 3 of fair value hierarchy [member] | Financial assets available-for-sale, category [member] |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Beginning Balance | 904,790 | 30,526 | 741,089 | 778,866
Purchases | 2,649 | 89 | 495,928 | 2,010
Total gain or loss in profit or loss | 28 | 1 | (100,734) | (15,891)
Total gain or loss in other comprehensive income | 17,284 | 583 | (202,565) | 21,195
Disposals | (16,202) | (547) | (28,928) | (45,091)
Ending Balance | $ 908,549 | $ 30,652 | $ 904,790 | $ 741,089

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