Alger Mid Cap 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 Mid Cap Growth Fund | Class Z | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 17.23% | 20.45% | 23.37% | (34.91%) | 7.34% | 64.09% | 30.27% | (7.11%) | 29.98% | 1.14% |