Alger Weatherbie Specialized Growth Fund Annual Total Returns |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Class Z Shares [Member] | Alger Weatherbie Specialized Growth Fund | Class Z | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 0.85% | 14.03% | 11.69% | (37.90%) | 5.90% | 57.31% | 39.62% | (3.88%) | 38.39% | 3.85% |