S000023782 [Member] Annual Fund Operating Expenses - AMG GW&K Small Cap Core Fund |
Dec. 31, 2025 |
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|---|---|---|---|---|
| Class N | ||||
| Prospectus [Line Items] | ||||
| Management Fees (as a percentage of Assets) | 0.70% | |||
| Distribution and Service (12b-1) Fees | 0.25% | |||
| Other Expenses (as a percentage of Assets): | 0.35% | [1] | ||
| Expenses (as a percentage of Assets) | 1.30% | |||
| Class I | ||||
| Prospectus [Line Items] | ||||
| Management Fees (as a percentage of Assets) | 0.70% | |||
| Distribution and Service (12b-1) Fees | 0.00% | |||
| Other Expenses (as a percentage of Assets): | 0.25% | [1] | ||
| Expenses (as a percentage of Assets) | 0.95% | |||
| Class Z | ||||
| Prospectus [Line Items] | ||||
| Management Fees (as a percentage of Assets) | 0.70% | |||
| Distribution and Service (12b-1) Fees | 0.00% | |||
| Other Expenses (as a percentage of Assets): | 0.20% | [1] | ||
| Expenses (as a percentage of Assets) | 0.90% | |||
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