Common Stock, Conversion Of Existing Interests

No definition available.

Name:	gshd_CommonStockConversionOfExistingInterests
Namespace Prefix:	gshd_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Common Stock, Number Of Classes

+ References

No definition available.

+ Details

Name:	gshd_CommonStockNumberOfClasses
Namespace Prefix:	gshd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Common Stock, Vote Per Share

+ References

No definition available.

+ Details

Name:	gshd_CommonStockVotePerShare
Namespace Prefix:	gshd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Corporate-Owned Locations

+ References

No definition available.

+ Details

Name:	gshd_NumberOfCorporateOwnedLocations
Namespace Prefix:	gshd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of franchised outlets in operation at the balance sheet date when there are significant changes in franchisor-owned outlets or franchised outlets during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 952
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109207840&loc=SL51750552-203207

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 952
-SubTopic 605
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=68064525&loc=d3e68639-108044

+ Details

Name:	us-gaap_SignificantChangesFrachisedOutletsInOperation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of franchises sold during the period when there are significant changes in franchisor-owned outlets or franchised outlets during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 952
-SubTopic 605
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064525&loc=d3e68639-108044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 952
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109207840&loc=SL51750552-203207

+ Details

Name:	us-gaap_SignificantChangesFranchisesSold
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_SubsidiarySaleOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=gshd_GooseheadInsuranceHoldingLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=gshd_GooseheadInsuranceAgencyLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=gshd_GooseheadInsuranceInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=gshd_GooseheadFinancialLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=gshd_PreIPOLLCMembersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=gshd_PreIPOLLCMembersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=gshd_GooseheadManagementLLCAndTexasWasatchInsuranceHoldingsGroupLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gshd_GooseheadManagementNoteAndTexasWasatchNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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, 2019 carrier location franchise	Dec. 31, 2018 franchise location
Subsidiary, Sale of Stock [Line Items]
Corporate-owned locations \| location			7	7
Franchise locations sold \| franchise			247	214
Operating franchise locations \| franchise			614	457
Number of classes \| class		2
Vote per share \| vote		1
Conversion ratio		1
Class A Common Stock
Subsidiary, Sale of Stock [Line Items]
Vote per share \| carrier			1
Class B Common Stock
Subsidiary, Sale of Stock [Line Items]
Vote per share \| carrier			1
Initial Public Offering \| Class A Common Stock
Subsidiary, Sale of Stock [Line Items]
Shares issued (in shares)		9,810
Share price (in dollars per share) \| $ / shares		$ 10.00
Over-Allotment Option \| Class A Common Stock
Subsidiary, Sale of Stock [Line Items]
Shares issued (in shares)		1,280
Goosehead Insurance Holding, LLC \| Goosehead Insurance Agency, LLC
Subsidiary, Sale of Stock [Line Items]
Ownership interest			100.00%
Goosehead Insurance, Inc. \| Goosehead Financial, LLC
Subsidiary, Sale of Stock [Line Items]
Ownership interest	37.30%
Pre-IPO LLC Members \| Goosehead Financial, LLC
Subsidiary, Sale of Stock [Line Items]
Ownership interest	62.70%
Pre-IPO LLC Members \| Class B Common Stock
Subsidiary, Sale of Stock [Line Items]
Shares issued (in shares)		22,747
Goosehead Management, LLC And Texas Wasatch Insurance Holdings Group LLC \| Class A Common Stock
Subsidiary, Sale of Stock [Line Items]
Shares issued (in shares)		3,724
Goosehead Management Note and Texas Wasatch Note
Subsidiary, Sale of Stock [Line Items]
Principal amount of debt \| $		$ 114