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Trade Receivables, Net - Summary of Movement of Allowance for Doubtful Trade Receivables (Detail) - Trade receivables [member] $ 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 financial assets [Line Items] |  |  |  |
Beginning balance | $ 53,709 | $ 1,812 | $ 82,906 | $ 84,145
Impairment losses recognized | 13,629 | 460 | (28,022) | 8,232
Amount written off | (34) | (1) |  | (7,826)
Effect of foreign currency exchange differences | (2,403) | (81) | (1,175) | (1,645)
Ending balance | 64,901 | 2,190 | 53,709 | 82,906
Impaired individually [member] |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |
Beginning balance | 16,453 | 555 | 39,046 | 28,305
Impairment losses recognized | 9,527 | 322 | (21,501) | 18,816
Amount written off |  |  |  | (7,617)
Effect of foreign currency exchange differences | (850) | (29) | (1,092) | (458)
Ending balance | 25,130 | 848 | 16,453 | 39,046
Impaired collectively [member] |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |
Beginning balance | 37,256 | 1,257 | 43,860 | 55,840
Impairment losses recognized | 4,102 | 138 | (6,521) | (10,584)
Amount written off | (34) | (1) |  | (209)
Effect of foreign currency exchange differences | (1,553) | (52) | (83) | (1,187)
Ending balance | $ 39,771 | $ 1,342 | $ 37,256 | $ 43,860

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