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Consolidated Statements of Comprehensive Income
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
TWD ($)
$ / shares
Dec. 31, 2019
TWD ($)
$ / shares
Statement [LineItems]        
Revenue $ 27,400,035 $ 987,745 $ 23,011,381 $ 20,337,881
Cost of revenue (20,146,057) (726,246) (17,979,208) (16,411,742)
Gross profit 7,253,978 261,499 5,032,173 3,926,139
Sales and marketing expenses (73,928) (2,665) (56,978) (56,076)
General and administrative expenses (604,029) (21,774) (528,759) (498,241)
Research and development expenses (1,139,219) (41,068) (1,015,512) (1,007,631)
Other income (expenses), net 125,587 4,527 135,578 92,928
Operating profit 5,562,389 200,519 3,566,502 2,457,119
Interest income 9,980 360 27,778 64,368
Other income 34,496 1,243 21,157 10,759
Other gains and losses (65,829) (2,373) (323,267) (148,414)
Finance costs (131,184) (4,729) (171,482) (180,262)
Share of (loss) profit of associates and joint ventures accounted for using equity method 625,733 22,557 (147,329) (154,926)
Gain on disposal of investment accounted for using equity method       973,609
Profit before income tax 6,035,585 217,577 2,973,359 3,022,253
Income tax expense (1,098,318) (39,593) (594,381) (513,679)
Profit for the year 4,937,267 177,984 2,378,978 2,508,574
Other comprehensive income (loss):        
Profit (Loss) on remeasurements of defined benefit plans (14,999) (541) (51,990) 20,916
Unrealized (loss) gain on valuation of equity instruments at fair value through other comprehensive income 122,514 4,416 140,199 (52,549)
Share of other comprehensive income of associates and joint ventures accounted for using equity method that will not be reclassified to profit or loss 28,843 1,040 23,143 5,732
Income tax effect on components that will not be reclassified to profit or loss (27,460) (990) (24,396) 2,833
Components of other comprehensive (loss) income that will not be reclassified to profit or loss 108,898 3,925 86,956 (23,068)
Exchange differences on translation of foreign operations (24,695) (890) 28,352 (104,198)
Components of other comprehensive (loss) income that will be reclassified to profit or loss (24,695) (890) 28,352 (104,198)
Other comprehensive (loss) income, net of income tax 84,203 3,035 115,308 (127,266)
Total comprehensive income for the year $ 5,021,470 $ 181,019 $ 2,494,286 $ 2,381,308
Ordinary shares [member]        
Other comprehensive income (loss):        
Earnings per share — basic | (per share) $ 6.79 $ 0.24 $ 3.27 $ 3.45
Earnings per share — diluted | (per share) 6.65 0.24 3.23 3.40
American depositary share (each representing 20 common shares) [member]        
Other comprehensive income (loss):        
Earnings per share — basic | (per share) 135.78 4.89 65.42 69.00
Earnings per share — diluted | (per share) $ 132.93 $ 4.79 $ 64.57 $ 68.06