S000009877 [Member] Expense Example - AMG TimesSquare Small Cap Growth Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class Z | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 99 |
| Expense Example, with Redemption, 3 Years | 330 |
| Expense Example, with Redemption, 5 Years | 580 |
| Expense Example, with Redemption, 10 Years | 1,297 |
| Class N | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 119 |
| Expense Example, with Redemption, 3 Years | 393 |
| Expense Example, with Redemption, 5 Years | 687 |
| Expense Example, with Redemption, 10 Years | 1,525 |
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 105 |
| Expense Example, with Redemption, 3 Years | 349 |
| Expense Example, with Redemption, 5 Years | 613 |
| Expense Example, with Redemption, 10 Years | $ 1,366 |