Alger Small Cap Growth Institutional 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 |
|
| Class Z2 Shares [Member] | Alger Small Cap Growth Institutional Fund | Class Z-2 | |||||||||
| Prospectus [Line Items] | |||||||||
| Annual Return [Percent] | 5.30% | 8.22% | 15.23% | (37.94%) | (4.63%) | 65.38% | 30.25% | 0.32% | 28.80% |