Alger Mid 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 Mid Cap Growth Institutional Fund | Class Z-2 | |||||||||
| Prospectus [Line Items] | |||||||||
| Annual Return [Percent] | 17.28% | 20.31% | 23.22% | (34.98%) | 4.75% | 64.57% | 30.20% | (7.49%) | 29.85% |