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Non-cash Transactions - Summary of Non-cash Investing Activities (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Payments for property, plant and equipment        
Purchase of property, plant and equipment $ 23,677,682 $ 798,842 $ 27,680,862 $ 28,280,821
Increase (decrease) in prepayments for property, plant and equipment (recorded under the line item of other non-current assets) 90,560 3,055 (89,337) (267,334)
(Increase) decrease in payables for property, plant and equipment (recorded under the line item of other payables) 982,260 33,140 (823,171) 2,314,772
Capitalized borrowing costs (51,262) (1,729) (54,191) (48,135)
Payments for property, plant and equipment 24,699,240 833,308 26,714,163 30,280,124
Proceeds from disposal of property, plant and equipment        
Consideration from disposal of property, plant and equipment 1,487,334 50,180 692,826 201,766
(Increase) decrease in other receivables 876 30 (22,626) 41,265
Proceeds from disposal of property, plant and equipment 1,488,210 50,210 670,200 243,031
Payments for investment properties        
Purchase of investment properties 186,535 6,293    
Capitalized borrowing costs (13)      
Proceeds from disposals of investment property 186,522 6,293    
Payments for other intangible assets        
Purchase of other intangible assets 277,825 9,373 675,144 491,135
Decrease (increase) in other payables 60,159 2,030 (120,938)  
Increase in other non-current liabilities     (40,313)  
Purchase of intangible assets classified as investing activities 337,984 11,403 $ 513,893 $ 491,135
Net cash inflow from disposal of subsidiaries        
Consideration from disposal of subsidiaries 7,046,464 237,735    
Increase in other payables 3,552 120    
Cash and cash equivalents disposed of (29,133) (983)    
Net cash inflow from disposal of subsidiaries $ 7,020,883 $ 236,872