Shareholder Report, Average Annual Return (Details) |
6 Months Ended | 12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2026 |
Jun. 30, 2026 |
Jun. 30, 2026 |
|
| C000025443 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Longleaf Partners Fund | |||
| C000117771 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Longleaf Partners Global Fund | |||
| C000025444 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Longleaf Partners Small-Cap Fund | |||
| Without Sales Load [Member] | C000025443 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | (0.77%) | 2.22% | 1.23% | 5.98% |
| Without Sales Load [Member] | C000117771 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 1.21% | 9.33% | 2.74% | 7.56% |
| Without Sales Load [Member] | C000025444 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | (5.12%) | (2.10%) | 1.17% | 5.30% |
| S&P 500 Index TR | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | S&P 500<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Index | |||
| Average Annual Return, Percent | 10.21% | 22.32% | 13.41% | 15.51% |
| MSCI WORLD INDEX Net (USD) | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | MSCI World Index | |||
| Average Annual Return, Percent | 9.69% | 21.34% | 11.47% | 13.14% |
| Russell 2000 Total Return | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Russell 2000<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Index | |||
| Average Annual Return, Percent | 22.57% | 40.78% | 6.98% | 11.62% |
| Russell 1000 Value Total Return | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Russell 1000<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Value Index | |||
| Average Annual Return, Percent | 16.23% | 27.09% | 11.17% | 11.52% |
| FTSE Developed Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | FTSE Developed Index | |||
| Average Annual Return, Percent | 11.40% | 23.73% | 11.68% | 13.23% |
| MSCI World Value Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | MSCI World Value Index | |||
| Average Annual Return, Percent | 10.50% | 20.84% | 10.51% | 10.16% |
| Russell 2000 Value Total Return | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Russell 2000<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Value Index | |||
| Average Annual Return, Percent | 22.99% | 43.01% | 8.23% | 10.89% |
| Russell 3000 Total Return Index | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Russell 3000<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Index | |||
| Average Annual Return, Percent | 10.86% | 22.81% | 12.30% | 15.06% |