Alger Mid Cap Focus 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 |
|
| Class Z Shares [Member] | Alger Mid Cap Focus Fund | Class Z | ||||||
| Prospectus [Line Items] | ||||||
| Annual Return [Percent] | 15.33% | 31.90% | 16.89% | (37.16%) | 10.26% | 84.85% |