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Organization - Narrative (Details) $ / shares in Units, shares in Thousands, $ in Millions			12 Months Ended
	May 02, 2018	May 01, 2018 USD ($) vote class $ / shares shares	Dec. 31, 2025 vote franchise location	Dec. 31, 2024 franchise location	Dec. 31, 2023 franchise location
Subsidiary, Sale of Stock [Line Items]
Corporate-owned locations (in locations) | location			14	14	14
Franchise locations sold (in franchises) | franchise			101	97	209
Operating franchise locations (in franchises) | franchise			1,009	1,103	1,226
Franchises purchased (in franchises) | franchise			0	0	0
Number of classes (in classes) | class		2
Vote per share (in votes) | vote		1
Conversion ratio		1
Goosehead Management Note and Texas Wasatch Note
Subsidiary, Sale of Stock [Line Items]
Principal amount of debt | $		$ 114
Goosehead Insurance Agency, LLC | Goosehead Insurance Holding, LLC
Subsidiary, Sale of Stock [Line Items]
Ownership interest			100.00%
Goosehead Insurance Holding, LLC | Goosehead Financial, LLC
Subsidiary, Sale of Stock [Line Items]
Ownership interest			100.00%
Goosehead Financial, LLC | Goosehead Insurance, Inc.
Subsidiary, Sale of Stock [Line Items]
Ownership interest	37.30%
Goosehead Financial, LLC | Pre-IPO LLC Members
Subsidiary, Sale of Stock [Line Items]
Ownership interest	62.70%
Class A Common Stock
Subsidiary, Sale of Stock [Line Items]
Vote per share (in votes) | vote			1
Class A Common Stock | Goosehead Management, LLC And Texas Wasatch Insurance Holdings Group LLC
Subsidiary, Sale of Stock [Line Items]
Shares issued (in shares)		3,724
Class A Common Stock | Initial Public Offering
Subsidiary, Sale of Stock [Line Items]
Shares issued in transaction (in shares)		9,810
Share price (in dollars per share) | $ / shares		$ 10.00
Class A Common Stock | Over-Allotment Option
Subsidiary, Sale of Stock [Line Items]
Shares issued in transaction (in shares)		1,280
Class B Common Stock
Subsidiary, Sale of Stock [Line Items]
Vote per share (in votes) | vote			1
Class B Common Stock | Pre-IPO LLC Members
Subsidiary, Sale of Stock [Line Items]
Shares issued (in shares)		22,747

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