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 |
Dec. 31, 2016 |
|
| Class I R Shares [Member] | Alger Mid Cap Growth Institutional Fund | Class I | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 17.01% | 20.02% | 22.68% | (35.28%) | 4.42% | 64.10% | 29.80% | (7.79%) | 29.55% | 1.43% |