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Significant Assets and Liabilities Denominated in Foreign Currencies - Summary of Significant Assets and Liabilities Denominated in Foreign Currencies (Detail) ¥ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 TWD ($)	Dec. 31, 2016 TWD ($)	Dec. 31, 2015	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 JPY (¥)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 JPY (¥)
US Dollar [member] | US dollar equals to New Taiwan dollar [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	$ 91,223,195	$ 100,186,466		$ 3,065,296			$ 3,106,557
Financial liabilities	$ 86,393,137	$ 97,178,536		2,902,995			3,013,288
Exchange Rate	US$1=NT$29.76	US$1=NT$32.25	US$1=NT$32.825
Exchange Rate	US$1=NT$29.76	US$1=NT$32.25	US$1=NT$32.825
US Dollar [member] | US dollar equals to Chinese yuan [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets				1,193,369	¥ 35,514,653		1,020,769	¥ 32,919,814
Financial liabilities				1,007,629	¥ 29,987,042		891,487	¥ 28,750,462
Exchange Rate	US$1=CNY6.5342	US$1=CNY6.9370
Exchange Rate	US$1=CNY6.5342	US$1=CNY6.9370
Japanese Yen [Member] | Japanese yen equals to New Taiwan dollar [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	$ 1,322,436	$ 1,371,471				¥ 5,005,435			¥ 4,976,309
Financial liabilities	$ 1,430,822	$ 1,621,001				5,415,677			5,881,716
Exchange Rate	JPY1=NT$0.2642	JPY1=NT$0.2756
Exchange Rate	JPY1=NT$0.2642	JPY1=NT$0.2756
Japanese Yen [Member] | Japanese yen equals to US dollar [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets				2,143,530		8,113,284	2,556,951		9,277,760
Financial liabilities				$ 2,271,811		¥ 8,598,832	$ 2,630,259		¥ 9,543,756
Exchange Rate	JPY1=US$0.0089	JPY1=US$0.0085
Exchange Rate	JPY1=US$0.0089	JPY1=US$0.0085

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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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