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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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