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Financial Risk Management and Fair Values of Financial Instruments - Summary of Movements in Relation to Loss Allowance for Contract Assets, Accounts Receivable and Other Receivables (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [Line Items]
Financial assets beginning balance	$ 9,642,833
Financial assets ending balance	10,131,324	$ 9,642,833
Contract assets [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets beginning balance	(114)	(135)
Adjustments for applying new standards			$ (115)
Provision for impairment loss	(3)		(20)
Reversal of impairment loss	0	21
Financial assets ending balance	(117)	(114)	(135)
Contract assets [member] \| IFRS 9 [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets beginning balance			(115)
Accounts receivable including related parties [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets beginning balance	(1,351)	(2,141)
Adjustments for applying new standards			(1,819)
Provision for impairment loss	(269)		(322)
Reversal of impairment loss	0	790
Financial assets ending balance	(1,620)	(1,351)	(2,141)
Accounts receivable including related parties [member] \| IFRS 9 [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets beginning balance			(1,819)
Other receivable including related parties [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets beginning balance	(18)	(13)
Adjustments for applying new standards			(7)
Provision for impairment loss	0	(5)	(7)
Reversal of impairment loss	8		1
Financial assets ending balance	$ (10)	$ (18)	(13)
Other receivable including related parties [member] \| IFRS 9 [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets beginning balance			$ (7)

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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