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Equity - Summary of Non-controlling Interests (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Beginning balance $ 166,841,165   $ 165,924,980 $ 155,691,394
Share of profit for the year (Note 28) 1,677,941 $ 56,611 1,253,438 968,567
Exchange difference on translating foreign operations (5,287,734) (178,399) (6,445,643) (63,509)
Unrealized gain on available-for-sale financial assets 224,036 7,559 (248,599) 10,451
Defined benefit plan actuarial gains (losses) 205,344 6,928 (417,181) (62,911)
Ending balance 201,310,187 6,791,842 166,841,165 165,924,980
Non-controlling interests [member]        
Beginning balance 12,000,551 404,877 11,492,545 8,209,860
Share of profit for the year (Note 28) 1,677,941 56,611 1,253,438 968,567
Exchange difference on translating foreign operations (334,920) (11,300) (601,787) (74,968)
Unrealized gain on available-for-sale financial assets 5,763 194 1,129 3,928
Defined benefit plan actuarial gains (losses) (13,724) (463) 8,846 (3,440)
Non-controlling interests arising from acquisition of subsidiaries (Note 28)     42,857  
Partial disposal of subsidiaries (Note 30) (3,055) (103) 26,436 1,712,836
Repurchase of outstanding ordinary shares of subsidiaries (Note 30)     (912,886)  
Spin-off of subsidiaries       3,006
Non-controlling interest relating to outstanding vested employee share options held by the employees of subsidiaries 263,213 8,880 927,823 904,904
Non-controlling interest relating to outstanding expired employee share options (159,200) (5,371)    
Cash dividends to non-controlling interests (246,440) (8,314) (237,850) (232,148)
Ending balance $ 13,190,129 $ 445,011 $ 12,000,551 $ 11,492,545