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Share-based Payments Arrangement - CHTSC's Employee Stock Options Outstanding (Detail) - CHT Security Co., Ltd. (CHTSC) [Member] | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 $ / shares | Dec. 31, 2022 $ / shares | Dec. 31, 2021 $ / shares | Dec. 31, 2020 $ / shares
Granted on December 20, 2019 [Member] |  |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Options [Line Items] |  |  |  |
Number of Options Outstanding | 40 | 1,083 | 3,174 | 4,328
Weighted-average Remaining Contractual Life (Years) | 11 months 19 days | 1 year 11 months 19 days | 2 years 11 months 19 days |
Weighted-average Exercise Price | $ 19.085 | $ 19.085 | $ 19.085 | $ 19.085
Options Exercisable Number of Options | 40 | 31 | 1,058 |
Option Exercisable Weighted-average Exercise Price | $ 19.085 | $ 19.085 | $ 19.085 |
Granted on February 20, 2021 [Member] |  |  |  |
Disclosure Of Range Of Exercise Prices Of Outstanding Share Options [Line Items] |  |  |  |
Number of Options Outstanding | 1,519 | 2,343 | 3,324 | 0
Weighted-average Remaining Contractual Life (Years) | 2 years 1 month 20 days | 3 years 1 month 20 days | 4 years 1 month 20 days |
Weighted-average Exercise Price | $ 19.085 | $ 19.085 | $ 19.085 | $ 0
Options Exercisable Number of Options | 7 | 7 | 0 |
Option Exercisable Weighted-average Exercise Price | $ 19.085 | $ 19.085 | $ 0 |

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