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Income Tax - Expiry Period Information of Unused Operating Loss Carryforward (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2016
TWD ($)
Disclosure of unused operating loss carryforward [line items]  
Operating loss carryforward for which no deferred tax assets recognized $ 178.1
Expiration period one [member]  
Disclosure of unused operating loss carryforward [line items]  
Operating loss carryforward for which no deferred tax assets recognized $ 136.7
Expiration period one [member] | Bottom of range [member]  
Disclosure of unused operating loss carryforward [line items]  
Operating loss carryforward expiry period 1 year
Expiration period one [member] | Top of range [member]  
Disclosure of unused operating loss carryforward [line items]  
Operating loss carryforward expiry period 4 years
Expiration period two [member]  
Disclosure of unused operating loss carryforward [line items]  
Operating loss carryforward for which no deferred tax assets recognized $ 41.4
Expiration period two [member] | Bottom of range [member]  
Disclosure of unused operating loss carryforward [line items]  
Operating loss carryforward expiry period 5 years
Expiration period two [member] | Top of range [member]  
Disclosure of unused operating loss carryforward [line items]  
Operating loss carryforward expiry period 10 years