Alger Spectra 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 |
|
| Class Y Shares [Member] | Alger Spectra Fund | Class Y | |||||||
| Prospectus [Line Items] | |||||||
| Annual Return [Percent] | 29.92% | 48.22% | 41.90% | (39.08%) | 12.10% | 44.09% | 32.73% |