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Trade Receivables, Net - Summary of Movement of Allowance for Doubtful Trade Receivables (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Disclosure of financial assets [Line Items] |  |  |  |
Impairment losses recognized | $ (3,267) | $ (100,000) |  |
Trade receivables [member] |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |
Beginning balance | 2,120 | 64,901 | $ 53,709 | $ 82,906
Impairment losses recognized |  |  | 13,629 | (28,022)
Amounts written off | (1,964) | (60,109) | (34) |
Effect of foreign currency exchange differences | (98) | (3,013) | (2,403) | (1,175)
Ending balance | $ 5,077 | 155,389 | 64,901 | 53,709
Trade receivables [member] | Impaired individually [member] |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |
Beginning balance |  | 25,130 | 16,453 | 39,046
Impairment losses recognized |  |  | 9,527 | (21,501)
Effect of foreign currency exchange differences |  |  | (850) | (1,092)
Ending balance |  |  | 25,130 | 16,453
Trade receivables [member] | Impaired collectively [member] |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |
Beginning balance |  | $ 39,771 | 37,256 | 43,860
Impairment losses recognized |  |  | 4,102 | (6,521)
Amounts written off |  |  | (34) |
Effect of foreign currency exchange differences |  |  | (1,553) | (83)
Ending balance |  |  | $ 39,771 | $ 37,256

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