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Noncontrolling interest - Ownership interests (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Noncontrolling Interest [Line Items]
Number of LLC units outstanding (in shares)	36,588	37,288
Noncontrolling interest, ownership percentage	100.00%	100.00%
Goosehead Financial, LLC
Noncontrolling Interest [Line Items]
Ownership interest held by Goosehead Insurance, Inc.	67.40%	66.20%
Noncontrolling interest holders
Noncontrolling Interest [Line Items]
Ownership interest held by noncontrolling interest holders	32.60%	33.80%
Parent
Noncontrolling Interest [Line Items]
Number of LLC units outstanding (in shares)	24,653	24,668
Noncontrolling interest
Noncontrolling Interest [Line Items]
Number of LLC units outstanding (in shares)	11,935	12,620

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- Definition

Noncontrolling Interest, Ownership Percentage

+ References

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- Definition

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Weighted average number of general partnership units outstanding determined by relating the portion of time within a reporting period that general partnership units have been outstanding to the total time in that period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-5

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