Alger Mid Cap Growth Portfolio Average Annual Total Returns - Class I2 [Member] |
12 Months Ended | 60 Months Ended | 120 Months Ended | |
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| S&P 500 Index (reflects no deductions for fees, expenses or taxes)[Member] | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 17.88% | 14.42% | 14.82% | |
| Russell Midcap Growth Index (reflects no deductions for fees, expenses or taxes)[Member] | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 8.66% | 6.65% | 12.49% | |
| Class I-2 | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 16.77% | 3.01% | 11.68% | |
| Performance Inception Date | May 03, 1993 |