Investments Accounted for Using the Equity Method - Summary of Investments Accounted for Using the Equity Method (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2025 TWD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 TWD ($)	Dec. 31, 2023 TWD ($)
Investments in subsidiaries, joint ventures and associates [abstract]
Investments in associates	$ 25,030,827	$ 797,922	$ 20,410,983
Investments in joint venture	0	0	12,357
Investments accounted for using the equity method	$ 25,030,827	$ 797,922	$ 20,423,340	$ 19,678,314

- Definition

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

+ References + Details