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Noncontrolling Interests - Schedule of Ownership of Legence Holdings (Details) | 4 Months Ended |
--- | --- | ---
Dec. 31, 2025 shares | Sep. 12, 2025
LGN A Units |  |
Noncontrolling Interest [Line Items] |  |
Common unit, outstanding (in shares) | 63,856,975 |
Legence Holdings LLC |  |
Noncontrolling Interest [Line Items] |  |
Common unit, outstanding (in shares) | 105,191,329 |
Issuance of Class A common stock for acquisitions (in shares) | 145,600 |
Effects of Secondary (in shares) | 0 |
Common unit, outstanding (in shares) | 105,336,929 |
Legence's Ownership of Legence Holdings Common Units (as percent) | 100.00% | 100.00%
Class A Common Stock issued as consideration for acquisitions | 0.00% |
Effects of Secondary Offering | 0.00% |
Legence Holdings LLC | LGN A Units |  |
Noncontrolling Interest [Line Items] |  |
Common unit, outstanding (in shares) | 58,510,567 |
Issuance of Class A common stock for acquisitions (in shares) | 145,600 |
Effects of Secondary (in shares) | 5,200,808 |
Common unit, outstanding (in shares) | 63,856,975 |
Legence's Ownership of Legence Holdings Common Units (as percent) | 60.60% | 55.60%
Class A Common Stock issued as consideration for acquisitions | 0.10% |
Effects of Secondary Offering | 4.90% |
Legence Holdings LLC | LGN B Units |  |
Noncontrolling Interest [Line Items] |  |
Common unit, outstanding (in shares) | 46,680,762 |
Issuance of Class A common stock for acquisitions (in shares) | 0 |
Effects of Secondary (in shares) | (5,200,808) |
Common unit, outstanding (in shares) | 41,479,954 |
Legacy Owners ownership of Legence Holdings Common Units (as percent) | 39.40% | 44.40%
Class A Common Stock issued as consideration for acquisitions | (0.10%) |
Effects of Secondary Offering | (4.90%) |

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