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Supplementary Cash Flow Information - Partial Cash Paid for Investing Activities (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Statement of cash flows [abstract]
Purchase of property, plant and equipment	$ 6,552,702		$ 4,133,615	$ 4,896,656
Add: Beginning balance of payable to contractors and equipment suppliers	1,145,359		972,770	1,516,735
Less: Ending balance of payable to contractors and equipment suppliers	(1,816,555)		(1,145,359)	(972,770)
Cash paid during the year	$ 5,881,506	$ 212,023	$ 3,961,026	$ 5,440,621

X

- Definition

The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment]

+ References

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X

- Definition

The cash outflow for the purchases of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment]

+ References

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- Definition

Beginning balance of payable to contractors and equipment suppliers

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- Definition

Ending balance of payable to contractors and equipment suppliers

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