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Noncontrolling Interests - Narrative (Details)	12 Months Ended
	Dec. 31, 2025 shares	Sep. 12, 2025 shares
Noncontrolling Interest [Line Items]
Conversion ratio	1
LGN B Units
Noncontrolling Interest [Line Items]
Conversion ratio	1
LGN B Units | Legence Parent
Noncontrolling Interest [Line Items]
Common stock, shares outstanding (in shares)	41,479,954
Legence Holdings LLC
Noncontrolling Interest [Line Items]
Common stock, shares outstanding (in shares)	105,336,929	105,191,329
Legence Holdings LLC | LGN B Units
Noncontrolling Interest [Line Items]
Common stock, shares outstanding (in shares)	41,479,954	46,680,762
Legence Holdings LLC | LGN B Units | Legence Parent
Noncontrolling Interest [Line Items]
Common stock, shares outstanding (in shares)	41,479,954

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- Definition

Limited Partners Capital, Unit Conversion Ratio

+ References

No definition available.

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X

- Definition

Number of common units of ownership outstanding of a limited liability company (LLC).

+ References

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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