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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	Jun. 07, 2018
Entity Information [Line Items]
Entity Registrant Name	Goosehead Insurance, Inc.
Entity Central Index Key	0001726978
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		13,533,267
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		22,746,667

Condensed Consolidated and Combined Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents	$ 6,331,916	$ 4,947,671
Restricted cash	609,632	417,911
Commissions and agency fees receivable, net	1,767,765	1,268,172
Receivable from franchisees, net	579,681	564,087
Prepaid expenses	740,050	521,362
Other assets	3,213,348	0
Total current assets	13,242,392	7,719,203
Receivable from franchisees, net of current portion	1,679,478	1,360,686
Property and equipment, net of accumulated depreciation	6,866,621	6,845,121
Intangible assets, net of accumulated amortization	235,878	216,468
Other assets	179,075	565,191
Total assets	22,203,444	16,706,669
Current Liabilities:
Accounts payable and accrued expenses	4,925,944	2,759,241
Premiums payable	609,632	417,911
Unearned revenue	775,050	1,062,050
Dividends payable	0	550,000
Deferred rent	460,674	477,818
Note payable	500,000	500,000
Total current liabilities	7,271,300	5,767,020
Deferred rent, net of current portion	4,217,549	3,916,257
Note payable, net of current portion	48,079,733	48,156,340
Total liabilities	59,568,582	57,839,617
Commitments and contingencies (see note 7)
Members’ deficit	(37,365,138)	(41,132,948)
Total liabilities and members’ deficit	$ 22,203,444	$ 16,706,669

Condensed Consolidated and Combined Statements of Income (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Revenues	$ 14,588,881	$ 9,890,949
Operating Expenses:
Employee compensation and benefits	6,835,424	4,867,647
General and administrative expenses	2,373,622	1,833,599
Bad debts	279,688	251,882
Depreciation and amortization	336,935	137,657
Total operating expenses	9,825,669	7,090,785
Income from operations	4,763,212	2,800,164
Other Income (Expense):
Interest expense	(995,402)	(532,715)
Net Income	$ 3,767,810	$ 2,267,449
Pro forma earnings per share:
Basic (in dollars per share)	$ 0.08	$ 0.05
Diluted (in dollars per share)	$ 0.08	$ 0.05
Commissions and agency fees
Revenues:
Revenues	$ 9,595,576	$ 6,361,846
Franchise revenues
Revenues:
Revenues	4,910,528	3,481,116
Interest income
Revenues:
Revenues	$ 82,777	$ 47,987

Condensed Consolidated and Combined Statements of Members' Deficit (Unaudited)	3 Months Ended
	Mar. 31, 2018 USD ($)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Members’ deficit, December 31, 2017	$ (41,132,948)
Net income	3,767,810
Capital withdrawn	0
Members’ deficit, March 31, 2018	$ (37,365,138)

Condensed Consolidated and Combined Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 3,767,810	$ 2,267,449
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	336,935	137,657
Bad debts	279,688	251,882
Changes in operating assets and liabilities:
Commissions and agency fees receivable	(705,261)	(191,651)
Receivable from franchisees	(413,833)	(278,955)
Prepaid expenses	(218,688)	(245,959)
Other assets	(2,827,232)	(33,844)
Accounts payable and accrued expenses	2,166,702	(153,595)
Deferred rent	284,148	(35,079)
Premiums payable	191,721	26,991
Unearned revenue	(287,000)	(255,000)
Net cash provided by operating activities	2,574,990	1,489,896
Cash flows from investing activities:
Changes in restricted cash	(191,721)	(26,991)
Proceeds from notes receivable	5,426	31,845
Purchase of software	(44,670)	(21,097)
Purchase of property and equipment	(334,080)	(79,833)
Net cash used for investing activities	(565,045)	(96,076)
Cash flows from financing activities:
Loan origination fees	49,300	33,000
Repayment of note payable	(125,000)	(75,000)
Dividends paid	(550,000)	(500,000)
Net cash used for financing activities	(625,700)	(542,000)
Net increase in cash and cash equivalents	1,384,245	851,820
Cash, beginning of period	4,947,671	3,778,098
Cash, end of period	$ 6,331,916	$ 4,629,918

Organization	3 Months Ended
Organization	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization On May 1, 2018 Goosehead Insurance, Inc. ("GSHD") completed an initial public offering (the “Offering”) of 9,809,500 shares of Class A common stock at a price of $10.00 per share, which included 1,279,500 shares issued pursuant to the underwriter's over-allotment option. GSHD became the sole managing member of Goosehead Financial, LLC (“GF”). The operations of GF represent the predecessor to GSHD prior to the Offering, and the consolidated and combined entities of GF are described in more detail below. GF was organized on January 1, 2016 as a Delaware Limited Liability Company and is headquartered in Westlake, TX. GF (collectively with its combined and consolidated subsidiaries and affiliates, the “Company”) provides personal and commercial property and casualty insurance brokerage services for its clients through a network of corporate-owned and franchise units across the nation. The operations of the corporate-owned units are reflected in the financial statements of Texas Wasatch Insurance Services, L.P. (“TWIS”)—a Texas limited partnership headquartered in Westlake, TX and operating since 2003. TWIS is 99.6% owned by Goosehead Insurance Holdings, LLC (“GIH”), a wholly owned subsidiary of GF. The Company had seven and four corporate-owned locations in operation at March 31, 2018 and 2017, respectively. The operations of the franchise units are reflected in the financial statements of Goosehead Insurance Agency, LLC (“GIA”)—a Delaware limited liability company headquartered in Westlake, TX and operating since 2011. GIA is 100% owned by GIH. Franchisees are provided access to insurance Carrier Appointments, product training, technology infrastructure, client service centers and back office services. During the three months ended March 31, 2018 and 2017, the Company sold 58 and 38 franchise locations and had 341 and 220 operating franchise locations, respectively. No franchises were purchased by the Company during the three months ended March 31, 2018 or 2017. All intercompany accounts and transactions have been eliminated in consolidation of GF. Basis of Combination In connection with the Offering, both Goosehead Management, LLC (“GM”) and Texas Wasatch Insurance Holdings Group LLC (“TWIHG”) became wholly owned indirect subsidiaries of GF. Both GM and TWIHG are non-operating holding companies created to receive management fees from the operating entities TWIS and GIA. All intercompany accounts and transactions have been eliminated in combination of the Company. Basis of Presentation The accompanying condensed consolidated and combined financial statements of the Company have been prepared in accordance with the instructions to Form 10-Q. Therefore, they do not include all of the annual disclosures required by accounting principles generally accepted in the United States of America ("GAAP"). However, in the opinion of management, these statements include all adjustments, consisting of normal recurring adjustments, which are necessary for a fair presentation of the condensed consolidated and combined financial position at March 31, 2018, and the condensed consolidated and combined results of operations, and cash flows for the periods ended March 31, 2018 and 2017. The interim period condensed consolidated and combined financial statements should be read in conjunction with the Consolidated and Combined Financial Statements that are included in the Final Prospectus.

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reported period. Accordingly, actual results could differ from those estimates as more information becomes known. Capitalized IPO Related Costs In connection with the Offering, the Company has incurred costs which have been recorded in other assets on the condensed consolidated and combined balance sheet. Upon completion of the Offering, these deferred costs were charged against the proceeds from the Offering with a corresponding reduction to additional paid-in capital. There were $3.2 million and $170 thousand of IPO related costs included in other assets at March 31, 2018 and December 31, 2017, respectively. Income Taxes Prior to the Offering, the Company was treated as a partnership for U.S. federal and applicable state and local income tax purposes. As a partnership, the Company's taxable income or loss was included in the taxable income of its members. Accordingly, no income tax expense has been recorded for federal and state and local jurisdictions. In connection with the Offering completed on May 1, 2018, the Company became a taxable entity. Recently Issued Accounting Pronouncements Statement of Cash Flows (ASU 2016-18): This standard requires that the Statement of Cash Flows explain the changes during the period of cash and cash equivalents inclusive of amounts categorized as Restricted Cash. As such, upon adoption, the Company’s consolidated and combined statement of cash flows will show the sources and uses of cash that explain the movement in the balance of cash and cash equivalents, inclusive of restricted cash, over the period presented. As an emerging growth company (“EGC”), the standard will become effective for the Company January 1, 2019. Statement of Cash Flows (ASU 2016-15): This standard addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain cash receipts and cash payments are presented and classified and applies to all entities, including both business entities and not-for-profit entities that are required to present a statement of cash flows under Topic 230. The standard will become effective for the Company on January 1, 2019. The Company has evaluated the impact of ASU 2016-15 and has determined the impact to be immaterial. The Company does not, at this time, engage in the activities being addressed. Revenue from Contracts with Customers (ASU 2014-09): This standard supersedes the existing revenue recognition guidance and provides a new framework for recognizing revenue. The core principle of the standard is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. The new standard also requires significantly more comprehensive disclosures than the existing standard. Guidance subsequent to ASU 2014-09 has been issued to clarify various provisions in the standard, including principal versus agent considerations, identifying performance obligations, licensing transactions, as well as various technical corrections and improvements. This standard may be adopted using either a retrospective or modified retrospective method. According to the superseding standard ASU 2015-14 that deferred the effective dates of the preceding, the standard will become effective for the Company January 1, 2019. The Company is currently in the process of evaluating the impact this standard is expected to have on the consolidated and combined financial statements. As the Company continues the evaluation during 2018, specifically as it relates to revenue recognition (commissions, contingent commissions, and franchise fees, among others), cost deferrals, systems and processes, the Company will further clarify the expected material impact of the adoption of the standard when known. Leases (ASU 2016-02): This standard establishes a new lease accounting model, which introduces the recognition of lease assets and liabilities for those leases classified as operating leases under previous GAAP. It should be applied using a modified retrospective approach, with the option to elect various practical expedients. Early adoption is permitted. The standard will become effective for us January 1, 2020. The Company is currently evaluating the impact this standard will have on the Company's consolidated and combined financial statements.

Franchise Fees Receivable

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Franchise Fees Receivable

The balance of Franchise fees receivable included in Receivable from franchisees consisted of the following at March 31, 2018 and December 31, 2017:



	March 31			December 31
	2018			2017
Franchise fees receivable	$	3,124,196		$	2,501,000
Less: Unamortized discount	(1,076,754		)	(823,391		)
Less: Allowance for uncollectible franchise fees	(409,542		)	(335,522		)
	$	1,637,900		$	1,342,087

Activity in the allowance for uncollectible franchise fees was as follows:



Balance at December 31, 2016	$	193,204
Charges to bad debts	140,493
Write offs	(84,162		)
Balance at March 31, 2017	$	249,535

Balance at December 31, 2017	335,522
Charges to bad debts	74,020
Write offs	—
Balance at March 31, 2018	$	409,542

Allowance for Uncollectible Agency Fees

Activity in the allowance for uncollectible agency fees was as follows:




Balance at December 31, 2016	$	166,681
Charges to bad debts	111,389
Write offs	(133,068		)
Balance at March 31, 2017	$	145,002

Balance at December 31, 2017	182,509
Charges to bad debts	205,668
Write offs	(181,033		)
Balance at March 31, 2018	$	207,144

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Allowance for Uncollectible Agency Fees

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Allowance for Uncollectible Agency Fees

Franchise Fees Receivable

The balance of Franchise fees receivable included in Receivable from franchisees consisted of the following at March 31, 2018 and December 31, 2017:



	March 31			December 31
	2018			2017
Franchise fees receivable	$	3,124,196		$	2,501,000
Less: Unamortized discount	(1,076,754		)	(823,391		)
Less: Allowance for uncollectible franchise fees	(409,542		)	(335,522		)
	$	1,637,900		$	1,342,087

Activity in the allowance for uncollectible franchise fees was as follows:



Balance at December 31, 2016	$	193,204
Charges to bad debts	140,493
Write offs	(84,162		)
Balance at March 31, 2017	$	249,535

Balance at December 31, 2017	335,522
Charges to bad debts	74,020
Write offs	—
Balance at March 31, 2018	$	409,542

Allowance for Uncollectible Agency Fees

Activity in the allowance for uncollectible agency fees was as follows:




Balance at December 31, 2016	$	166,681
Charges to bad debts	111,389
Write offs	(133,068		)
Balance at March 31, 2017	$	145,002

Balance at December 31, 2017	182,509
Charges to bad debts	205,668
Write offs	(181,033		)
Balance at March 31, 2018	$	207,144

- Definition

+ References + Details

Notes Receivable	3 Months Ended
Notes Receivable	Mar. 31, 2018
Receivables [Abstract]
Notes Receivable	Notes Receivable In 2015, the Company entered into a $100,000 revolving line of credit with a franchisee in the form of a note receivable. The note dated December 14, 2015 has a 5-year maturity with payments due monthly and is secured by the franchisee’s commissions. The note bears interest at 7% per annum. As of March 31, 2018 and December 31, 2017, the note balance was $61 thousand and $67 thousand, of which $22 thousand and $22 thousand was current.

Note payable

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Note payable

On October 27, 2016, the Company entered into a credit agreement consisting of a revolving credit facility and a note payable used to pay off existing debt and fund a distribution to members.

The $3,000,000 revolving credit facility accrues interest on amounts drawn at LIBOR plus 5.50%. At March 31, 2018 and December 31, 2017, the Company had a letter of credit of $500,000 applied against the maximum borrowing availability, at an interest rate of 5.50%, thus amounts available to draw totaled $2,500,000. No interest was paid during the three months ended March 31, 2018 or during 2017 on the revolving credit facility. The revolving credit facility is collateralized by substantially all the Company’s assets, which includes rights to future commissions.

The note payable on the consolidated and combined balance sheets includes a $50,000,000 term note payable in quarterly installments of $125,000 with a balloon payment of $47,250,000 on October 27, 2022. Interest is calculated at LIBOR plus 5.50% (7.20% and 6.45% at March 31, 2018 and December 31, 2017), and the note is collateralized by substantially all of the Company’s assets, which includes rights to future commissions. The balance of the note payable was $49,500,000, of which $500,000 was current, and $49,625,000, of which $500,000 was current, at March 31, 2018 and December 31, 2017, respectively.

Included as a reduction to the note payable are capitalized loan origination fees, the unamortized balance of which was $920,267 and $969,567 as of March 31, 2018 and December 31, 2017, respectively. The amortization of these loan origination fees is included in interest expense and totaled $49,300 and $33,000 during the three months ended March 31, 2018 and 2017, respectively.

Maturities of note payable for the next five years are as follows:



	Amount
As of March 31, 2018:
2018	$	375,000
2019	500,000
2020	500,000
2021	500,000
2022	47,625,000
	$	49,500,000

The Company’s note payable agreement contains certain restrictions and covenants. Under these restrictions, the Company is limited in the amount of debt incurred and distributions payable. In addition, the credit agreement contains certain change of control provisions that, if broken, would trigger a default. Finally, the Company must maintain certain financial ratios. As of March 31, 2018 and December 31, 2017, the Company was in compliance with these covenants. Because of both instruments’ origination date and variable interest rate, the note payable balance at March 31, 2018 and December 31, 2017, approximates fair value using Level 2 inputs, described below.

The framework for measuring fair value provides a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (level 1 measurements) and the lowest priority to unobservable inputs (level 3 measurements). The three levels of the fair value hierarchy are described as follows:


•	Level 1—Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets.


•	Level 2—Significant other observable inputs other than Level 1 prices such as quoted prices in markets that are not active, quoted prices for similar assets or other inputs that are observable, either directly or indirectly, for substantially the full term of the asset.


•	Level 3—Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.

The asset or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. The valuation techniques used need to maximize the use of observable inputs and minimize the use of unobservable inputs.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

The Company leases its facilities under non-cancelable operating leases, expiring in various years through 2029. In addition to monthly lease payments, the lease agreements require the Company to reimburse the lessors for its portion of operating costs each year.

The following is a schedule of future minimum lease payments as of March 31, 2018:



	Amount
2018	1,083,835
2019	1,251,306
2020	1,690,476
2021	1,761,524
2022	1,604,230
Thereafter	8,233,711
	$	15,625,082

Litigation	3 Months Ended
Litigation	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Litigation	Litigation From time to time, the Company may be involved in various legal proceedings, lawsuits and claims incidental to the conduct of the Company's business. The amount of any loss from the ultimate outcomes is not probable or reasonably estimable. It is the opinion of management that the resolution of outstanding claims will not have a material adverse effect on the financial position or results of operations of the Company.

Segment Information

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Information

The Company has two reportable segments: Corporate Channel and Franchise Channel. The Corporate Channel consists of company-owned and financed operations with employees who are hired, trained, and managed by Goosehead. The Franchise Channel network consists of franchisee operations that are owned and managed by individual business owners. These business owners have a contractual relationship with Goosehead to use the Company's processes, systems, and back-office support team to sell insurance and manage their business. In exchange, Goosehead is entitled to an initial franchise fee and ongoing royalty fees. Allocations of contingent commissions and certain operating expenses are based on reasonable assumptions and estimates primarily using revenue, headcount and other information. The Company’s chief operating decision maker uses earnings before interest, income taxes, depreciation and amortization, adjusted to exclude Class B unit compensation and other income (“Adjusted EBITDA”) as a performance measure to manage resources and make decisions about the business. Summarized financial information concerning the Company’s reportable segments is shown in the following table. There are no intersegment sales, only interest income and interest expense related to an intersegment line of credit, all of which eliminate in consolidation. The “Other” column includes any income and expenses not allocated to reportable segments and corporate-related items, including certain legal expenses and interest related to the note payable entered into on October 27, 2016.



	Corporate Channel			Franchise Channel			Other			Total
Three months ended March 31, 2018:
Revenues:
Commissions and fees	$	7,855,665		$	1,739,911		$	—		$	9,595,576
Franchise revenues	—			4,910,528			—			4,910,528
Interest income	—			82,777			—			82,777
Total	7,855,665			6,733,216			—			14,588,881
Operating expenses:
Employee compensation and benefits	4,044,587			2,790,837			—			6,835,424
General and administrative expenses	1,627,876			745,142			604			2,373,622
Bad debts	205,668			74,020			—			279,688
Total	5,878,131			3,609,999			604			9,488,734
Adjusted EBITDA	1,977,534			3,123,217			(604		)	5,100,147
Class B unit compensation	—			—			—			—
Interest expense	—			—			(995,402		)	(995,402		)
Depreciation and amortization	(236,182		)	(100,753		)	—			(336,935		)
Net income	$	1,741,352		$	3,022,464		$	(996,006	)	$	3,767,810
At March 31, 2018:
Total Assets	$	10,407,528		$	5,992,548		$	5,803,368		$	22,203,444



	Corporate Channel			Franchise Channel			Other			Total
Three months ended March 31, 2017:
Revenues:
Commissions and fees	$	5,549,105		$	812,741		$	—		$	6,361,846
Franchise revenues	—			3,481,116			—			3,481,116
Interest income	—			47,987			—			47,987
Total	5,549,105			4,341,844			—			9,890,949
Operating expenses:
Employee compensation and benefits	2,850,691			2,016,956			—			4,867,647
General and administrative expenses	1,124,572			694,143			14,884			1,833,599
Bad debts	111,389			140,493			—			251,882
Total	4,086,652			2,851,592			14,884			6,953,128
Adjusted EBITDA	1,462,453			1,490,252			(14,884		)	2,937,821
Other income (expense)	—			—			—			—
Class B unit compensation	—			—			—			—
Interest expense	—			—			(532,715		)	(532,715		)
Depreciation and amortization	(114,237		)	(23,420		)	—			(137,657		)
Net income	$	1,348,216		$	1,466,832		$	(547,599	)	$	2,267,449
At March 31, 2017:
Total Assets	$	3,269,874		$	3,299,877		$	3,433,388		$	10,003,139

Pro Forma Earnings Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Pro Forma Earnings Per Share

Following the Offering, GSHD became the sole managing member of GF and, as a result, it consolidates and combines the financial results of GF. GSHD will report a non-controlling interest representing the economic interest in GF held by the other members of GF.

Under the amended and restated Goosehead Financial, LLC Agreement, the Pre-IPO LLC Members will have the right, from and after the completion of the Offering (subject to the terms of the amended and restated Goosehead Financial, LLC Agreement), to require GSHD to redeem all or a portion of their LLC Units for, at GSHD's election, newly-issued shares of Class A common stock on a one-for-one basis or a cash payment equal to the volume weighted average market price of one share of GSHD's Class A common stock for each LLC Unit redeemed (subject to customary adjustments, including for stock splits, stock dividends and reclassifications) in accordance with the terms of the amended and restated Goosehead Financial, LLC Agreement. Additionally, in the event of a redemption request by a Pre-IPO LLC Member, GSHD may, at its option, effect a direct exchange of cash or Class A common stock for LLC Units in lieu of such a redemption. Shares of Class B common stock will be cancelled on a one-for-one basis if GSHD, at the election of a Pre-IPO LLC Member, redeems or exchanges LLC Units of such Pre-IPO LLC Member pursuant to the terms of the amended and restated Goosehead Financial, LLC Agreement. Except for transfers to GSHD pursuant to the amended and restated Goosehead Financial, LLC Agreement or to certain permitted transferees, the Pre-IPO LLC Members are not permitted to sell, transfer or otherwise dispose of any LLC Units or shares of Class B common stock.

The following table summarizes the pro forma ownership interest in GF as of March 31, 2018 and December 31, 2017.



	March 31, 2018		December 31, 2017
	LLC Units	Ownership %	LLC Units	Ownership %
Pro forma number of LLC Units held by Goosehead Insurance, Inc.	13,533,267	37.3%	13,533,267	37.3%
Pro forma number of LLC Units held by non-controlling interest holders	22,746,667	62.7%	22,746,667	62.7%
Total pro forma number of LLC Units outstanding	36,279,934	100.0%	36,279,934	100.0%

The weighted average ownership percentages for the applicable reporting periods are used to attribute net income to GSHD. and the non-controlling interest holders. The non-controlling interest holders' weighted average ownership percentage for the quarter ended March 31, 2018 and March 31, 2017 was 62.7%.

The following table sets forth the calculation of pro forma basic EPS based on net income attributable to GSHD. divided by the pro forma basic weighted average number of Class A common stock.



	Three Months Ended March 31
	2018		2017
Numerator:
Net income	$	3,767,810	$	2,267,449
Less: pro forma net income attributable to non-controlling interests	2,362,328		1,421,637
Pro forma income before taxes attributable to Goosehead Insurance, Inc.	$	1,405,482	$	845,812
Less: pro forma income tax expense	336,332		202,403
Pro forma net income attributable to Goosehead Insurance Inc.	1,069,150		643,409
Denominator:
Pro forma weighted average shares of Class A common stock outstanding	13,533,267		13,533,267
Pro forma earnings per share	$	0.08	$	0.05

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Credit Agreement On April 4, 2018, GIH and the other loan parties amended and restated the credit agreement to permit the reorganization transactions undertaken in connection with the Offering and provide additional flexibility under the covenants contained therein following the Offering. There was no additional borrowing as part of the amended and restated credit agreement. The Offering In connection with the Offering on May 1, 2018, 9,809,500 shares of Class A common stock were issued by GSHD. at a price of $10.00 per share, which included 1,279,500 shares issued pursuant to the underwriter's over-allotment option. After the Offering, 13,533,267 shares of Class A common stock were outstanding, including 3,723,767 shares issued to historical owners of GM and TWIHG. Also on May 1, 2018, in connection with certain reorganization transactions immediately prior to the Offering, historical Class B interests in TWIHG and GM were deemed vested by converting to notes paid by a combination of Offering proceeds and shares of Class A common stock. This conversion changed the nature of the Class B interests from a profit sharing arrangement to a substantive class of equity and resulted in $6,231,910 recorded as compensation expense. On the same day, Class B interests in GF were deemed vested by converting, along with all pre-IPO Class A equity, on a one-to-one basis with the number of LLC units previously owned, to both LLC Units and shares of Class B common stock. This conversion changed the nature of the Class B interests from a profit sharing arrangement to a substantive class of equity, expensed under the guidance of ASC 718. At the Offering price of $10.00 per share, GSHD issued a total of 1,978,058 LLC Units and shares of Class B common stock and incurred compensation expense of $19,780,578 as part of the conversion. Tax Receivable Agreement GSHD entered into a tax receivable agreement with the Pre-IPO LLC Members on May 1, 2018 that provides for the payment by GSHD to the Pre-IPO LLC Members of 85% of the amount of cash savings, if any, in U.S. federal, state and local income tax or franchise tax that we actually realize as a result of (i) any increase in tax basis in GSHD's assets and (ii) tax benefits related to imputed interest deemed arising as a result of payments made under the tax receivable agreement. During the three months ended March 31, 2018, no distributions or redemptions were made that triggered an increase in our tax basis.

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Basis of Combination

In connection with the Offering, both Goosehead Management, LLC (“GM”) and Texas Wasatch Insurance Holdings Group LLC (“TWIHG”) became wholly owned indirect subsidiaries of GF. Both GM and TWIHG are non-operating holding companies created to receive management fees from the operating entities TWIS and GIA.

All intercompany accounts and transactions have been eliminated in combination of the Company.

Basis of Presentation

The accompanying condensed consolidated and combined financial statements of the Company have been prepared in accordance with the instructions to Form 10-Q. Therefore, they do not include all of the annual disclosures required by accounting principles generally accepted in the United States of America ("GAAP"). However, in the opinion of management, these statements include all adjustments, consisting of normal recurring adjustments, which are necessary for a fair presentation of the condensed consolidated and combined financial position at March 31, 2018, and the condensed consolidated and combined results of operations, and cash flows for the periods ended March 31, 2018 and 2017. The interim period condensed consolidated and combined financial statements should be read in conjunction with the Consolidated and Combined Financial Statements that are included in the Final Prospectus.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reported period. Accordingly, actual results could differ from those estimates as more information becomes known.

Capitalized IPO Related Costs

In connection with the Offering, the Company has incurred costs which have been recorded in other assets on the condensed consolidated and combined balance sheet. Upon completion of the Offering, these deferred costs were charged against the proceeds from the Offering with a corresponding reduction to additional paid-in capital. There were $3.2 million and $170 thousand of IPO related costs included in other assets at March 31, 2018 and December 31, 2017, respectively.

Income Taxes

Prior to the Offering, the Company was treated as a partnership for U.S. federal and applicable state and local income tax purposes. As a partnership, the Company's taxable income or loss was included in the taxable income of its members. Accordingly, no income tax expense has been recorded for federal and state and local jurisdictions.

In connection with the Offering completed on May 1, 2018, the Company became a taxable entity.

Recently Issued Accounting Pronouncements

Statement of Cash Flows (ASU 2016-18): This standard requires that the Statement of Cash Flows explain the changes during the period of cash and cash equivalents inclusive of amounts categorized as Restricted Cash. As such, upon adoption, the Company’s consolidated and combined statement of cash flows will show the sources and uses of cash that explain the movement in the balance of cash and cash equivalents, inclusive of restricted cash, over the period presented. As an emerging growth company (“EGC”), the standard will become effective for the Company January 1, 2019.

Statement of Cash Flows (ASU 2016-15): This standard addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice in how certain cash receipts and cash payments are presented and classified and applies to all entities, including both business entities and not-for-profit entities that are required to present a statement of cash flows under Topic 230. The standard will become effective for the Company on January 1, 2019. The Company has evaluated the impact of ASU 2016-15 and has determined the impact to be immaterial. The Company does not, at this time, engage in the activities being addressed.

Revenue from Contracts with Customers (ASU 2014-09): This standard supersedes the existing revenue recognition guidance and provides a new framework for recognizing revenue. The core principle of the standard is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. The new standard also requires significantly more comprehensive disclosures than the existing standard. Guidance subsequent to ASU 2014-09 has been issued to clarify various provisions in the standard, including principal versus agent considerations, identifying performance obligations, licensing transactions, as well as various technical corrections and improvements. This standard may be adopted using either a retrospective or modified retrospective method. According to the superseding standard ASU 2015-14 that deferred the effective dates of the preceding, the standard will become effective for the Company January 1, 2019. The Company is currently in the process of evaluating the impact this standard is expected to have on the consolidated and combined financial statements. As the Company continues the evaluation during 2018, specifically as it relates to revenue recognition (commissions, contingent commissions, and franchise fees, among others), cost deferrals, systems and processes, the Company will further clarify the expected material impact of the adoption of the standard when known.

Leases (ASU 2016-02): This standard establishes a new lease accounting model, which introduces the recognition of lease assets and liabilities for those leases classified as operating leases under previous GAAP. It should be applied using a modified retrospective approach, with the option to elect various practical expedients. Early adoption is permitted. The standard will become effective for us January 1, 2020. The Company is currently evaluating the impact this standard will have on the Company's consolidated and combined financial statements.

Framework for Measuring Fair Value


•	Level 1—Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets.


•	Level 2—Significant other observable inputs other than Level 1 prices such as quoted prices in markets that are not active, quoted prices for similar assets or other inputs that are observable, either directly or indirectly, for substantially the full term of the asset.


•	Level 3—Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.

- Definition

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

+ References + Details

Franchise Fees Receivable (Tables)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Schedule of Franchise Fees Receivable

The balance of Franchise fees receivable included in Receivable from franchisees consisted of the following at March 31, 2018 and December 31, 2017:



	March 31			December 31
	2018			2017
Franchise fees receivable	$	3,124,196		$	2,501,000
Less: Unamortized discount	(1,076,754		)	(823,391		)
Less: Allowance for uncollectible franchise fees	(409,542		)	(335,522		)
	$	1,637,900		$	1,342,087

Activity in the allowance for uncollectible agency fees was as follows:




Balance at December 31, 2016	$	166,681
Charges to bad debts	111,389
Write offs	(133,068		)
Balance at March 31, 2017	$	145,002

Balance at December 31, 2017	182,509
Charges to bad debts	205,668
Write offs	(181,033		)
Balance at March 31, 2018	$	207,144

Schedule of Allowance For Uncollectible Franchise Fees

Activity in the allowance for uncollectible franchise fees was as follows:



Balance at December 31, 2016	$	193,204
Charges to bad debts	140,493
Write offs	(84,162		)
Balance at March 31, 2017	$	249,535

Balance at December 31, 2017	335,522
Charges to bad debts	74,020
Write offs	—
Balance at March 31, 2018	$	409,542

Allowance for Uncollectible Agency Fees (Tables)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Schedule of Allowance for Uncollectible Agency Fees

The balance of Franchise fees receivable included in Receivable from franchisees consisted of the following at March 31, 2018 and December 31, 2017:



	March 31			December 31
	2018			2017
Franchise fees receivable	$	3,124,196		$	2,501,000
Less: Unamortized discount	(1,076,754		)	(823,391		)
Less: Allowance for uncollectible franchise fees	(409,542		)	(335,522		)
	$	1,637,900		$	1,342,087

Activity in the allowance for uncollectible agency fees was as follows:




Balance at December 31, 2016	$	166,681
Charges to bad debts	111,389
Write offs	(133,068		)
Balance at March 31, 2017	$	145,002

Balance at December 31, 2017	182,509
Charges to bad debts	205,668
Write offs	(181,033		)
Balance at March 31, 2018	$	207,144

Note payable (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of Maturities of Note Payable

Maturities of note payable for the next five years are as follows:



	Amount
As of March 31, 2018:
2018	$	375,000
2019	500,000
2020	500,000
2021	500,000
2022	47,625,000
	$	49,500,000

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Lease Payments

The following is a schedule of future minimum lease payments as of March 31, 2018:



	Amount
2018	1,083,835
2019	1,251,306
2020	1,690,476
2021	1,761,524
2022	1,604,230
Thereafter	8,233,711
	$	15,625,082

Segment Information (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Schedule of Segment Information



	Corporate Channel			Franchise Channel			Other			Total
Three months ended March 31, 2018:
Revenues:
Commissions and fees	$	7,855,665		$	1,739,911		$	—		$	9,595,576
Franchise revenues	—			4,910,528			—			4,910,528
Interest income	—			82,777			—			82,777
Total	7,855,665			6,733,216			—			14,588,881
Operating expenses:
Employee compensation and benefits	4,044,587			2,790,837			—			6,835,424
General and administrative expenses	1,627,876			745,142			604			2,373,622
Bad debts	205,668			74,020			—			279,688
Total	5,878,131			3,609,999			604			9,488,734
Adjusted EBITDA	1,977,534			3,123,217			(604		)	5,100,147
Class B unit compensation	—			—			—			—
Interest expense	—			—			(995,402		)	(995,402		)
Depreciation and amortization	(236,182		)	(100,753		)	—			(336,935		)
Net income	$	1,741,352		$	3,022,464		$	(996,006	)	$	3,767,810
At March 31, 2018:
Total Assets	$	10,407,528		$	5,992,548		$	5,803,368		$	22,203,444



	Corporate Channel			Franchise Channel			Other			Total
Three months ended March 31, 2017:
Revenues:
Commissions and fees	$	5,549,105		$	812,741		$	—		$	6,361,846
Franchise revenues	—			3,481,116			—			3,481,116
Interest income	—			47,987			—			47,987
Total	5,549,105			4,341,844			—			9,890,949
Operating expenses:
Employee compensation and benefits	2,850,691			2,016,956			—			4,867,647
General and administrative expenses	1,124,572			694,143			14,884			1,833,599
Bad debts	111,389			140,493			—			251,882
Total	4,086,652			2,851,592			14,884			6,953,128
Adjusted EBITDA	1,462,453			1,490,252			(14,884		)	2,937,821
Other income (expense)	—			—			—			—
Class B unit compensation	—			—			—			—
Interest expense	—			—			(532,715		)	(532,715		)
Depreciation and amortization	(114,237		)	(23,420		)	—			(137,657		)
Net income	$	1,348,216		$	1,466,832		$	(547,599	)	$	2,267,449
At March 31, 2017:
Total Assets	$	3,269,874		$	3,299,877		$	3,433,388		$	10,003,139

Pro Forma Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Summary of Pro Forma Ownership Interest

The following table summarizes the pro forma ownership interest in GF as of March 31, 2018 and December 31, 2017.



	March 31, 2018		December 31, 2017
	LLC Units	Ownership %	LLC Units	Ownership %
Pro forma number of LLC Units held by Goosehead Insurance, Inc.	13,533,267	37.3%	13,533,267	37.3%
Pro forma number of LLC Units held by non-controlling interest holders	22,746,667	62.7%	22,746,667	62.7%
Total pro forma number of LLC Units outstanding	36,279,934	100.0%	36,279,934	100.0%

Schedule of Calculation of Pro Forma Basic EPS

The following table sets forth the calculation of pro forma basic EPS based on net income attributable to GSHD. divided by the pro forma basic weighted average number of Class A common stock.



	Three Months Ended March 31
	2018		2017
Numerator:
Net income	$	3,767,810	$	2,267,449
Less: pro forma net income attributable to non-controlling interests	2,362,328		1,421,637
Pro forma income before taxes attributable to Goosehead Insurance, Inc.	$	1,405,482	$	845,812
Less: pro forma income tax expense	336,332		202,403
Pro forma net income attributable to Goosehead Insurance Inc.	1,069,150		643,409
Denominator:
Pro forma weighted average shares of Class A common stock outstanding	13,533,267		13,533,267
Pro forma earnings per share	$	0.08	$	0.05

Organization - Narrative (Details)		3 Months Ended
Organization - Narrative (Details)	May 01, 2018 $ / shares shares	Mar. 31, 2018 location franchise	Mar. 31, 2017 location franchise
Subsidiary, Sale of Stock [Line Items]
Corporate-owned locations \| location		7	4
Franchise locations sold		58	38
Operating franchise locations		341	220
Franchises purchased		0	0
Initial Public Offering \| Subsequent Event \| Class A Common Stock
Subsidiary, Sale of Stock [Line Items]
Shares issued (in shares) \| shares	9,809,500
Share price (in dollars per share) \| $ / shares	$ 10
Over-Allotment Option \| Subsequent Event \| Class A Common Stock
Subsidiary, Sale of Stock [Line Items]
Shares issued (in shares) \| shares	1,279,500
Goosehead Insurance Holding, LLC \| Goosehead Insurance Agency, LLC
Subsidiary, Sale of Stock [Line Items]
Ownership interest		100.00%
Goosehead Insurance Holding, LLC \| Texas Wasatch Insurance Services, L.P.
Subsidiary, Sale of Stock [Line Items]
Ownership interest		99.60%

Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
IPO related costs included in other assets	$ 3,200	$ 170

Franchise Fees Receivable - Balance of Franchise Fees Receivable (Details) - Franchise Fees Receivable - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Franchise fees receivable	$ 3,124,196	$ 2,501,000
Less: Unamortized discount	(1,076,754)	(823,391)
Less: Allowance for uncollectible franchise fees	(409,542)	(335,522)	$ (249,535)	$ (193,204)
Net franchise fees receivable	$ 1,637,900	$ 1,342,087

Franchise Fees Receivable - Roll-Forward of Allowance (Details) - Franchise Fees Receivable - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 335,522	$ 193,204
Charges to bad debts	74,020	140,493
Write offs	0	(84,162)
Ending balance	$ 409,542	$ 249,535

Allowance for Uncollectible Agency Fees - Roll-Forward of Allowance (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]
Charges to bad debts	$ 279,688	$ 251,882
Agency Fees
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balance	182,509	166,681
Charges to bad debts	205,668	111,389
Write offs	(181,033)	(133,068)
Ending balance	$ 207,144	$ 145,002

Notes Receivable - Narrative (Details) - Notes Receivable - USD ($)	Dec. 14, 2015	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Note receivable, face amount				$ 100,000
Note receivable, term	5 years
Notes receivable, interest rate	7.00%
Notes receivable		$ 61,000	$ 67,000
Notes receivable, current		$ 22,000	$ 22,000

Note payable - Narrative (Details) - USD ($)		3 Months Ended
Note payable - Narrative (Details) - USD ($)	Oct. 27, 2016	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Note payable outstanding		$ 49,500,000
Long-term debt, current		500,000		$ 500,000
Loan origination fees		49,300	$ 33,000
Line of Credit
Debt Instrument [Line Items]
Letter of credit		$ 500,000		$ 500,000
Secured Debt
Debt Instrument [Line Items]
Note payable	$ 50,000,000
Installment payment	125,000
Balloon payment	$ 47,250,000
Effective interest rate		7.20%		6.45%
Note payable outstanding		$ 49,500,000		$ 49,625,000
Long-term debt, current		500,000		500,000
Unamortized capitalized loan origination fees		920,267		969,567
Loan origination fees		49,300	33,000
Secured Debt \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	5.50%
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing availability	$ 3,000,000
Remaining borrowing availability		2,500,000		$ 2,500,000
Interest paid		$ 0	$ 0
Revolving Credit Facility \| Line of Credit \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	5.50%
Letter of Credit \| Line of Credit
Debt Instrument [Line Items]
Interest rate		5.50%		5.50%

Note payable - Schedule of Maturities of Note Payable (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Debt Disclosure [Abstract]
2018	$ 375
2019	500
2020	500
2021	500
2022	47,625
Note payable outstanding	$ 49,500

Commitments And Contingencies - Narrative (Details)	Mar. 31, 2018 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2018	$ 1,083,835
2019	1,251,306
2020	1,690,476
2021	1,761,524
2022	1,604,230
Thereafter	8,233,711
Future minimum payments	$ 15,625,082

Segment Information - Schedule of Segment Information (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| segment	2
Revenues:
Revenues	$ 14,588,881	$ 9,890,949
Operating Expenses:
Employee compensation and benefits	6,835,424	4,867,647
General and administrative expenses	2,373,622	1,833,599
Bad debts	279,688	251,882
Total operating expenses	9,488,734	6,953,128
Adjusted EBITDA	5,100,147	2,937,821
Other income (expense)		0
Class B unit compensation	0	0
Interest expense	(995,402)	(532,715)
Depreciation and amortization	(336,935)	(137,657)
Net Income	3,767,810	2,267,449
Total Assets	22,203,444	10,003,139	$ 16,706,669
Operating Segments \| Corporate Channel
Revenues:
Revenues	7,855,665	5,549,105
Operating Expenses:
Employee compensation and benefits	4,044,587	2,850,691
General and administrative expenses	1,627,876	1,124,572
Bad debts	205,668	111,389
Total operating expenses	5,878,131	4,086,652
Adjusted EBITDA	1,977,534	1,462,453
Other income (expense)		0
Class B unit compensation	0	0
Interest expense	0	0
Depreciation and amortization	(236,182)	(114,237)
Net Income	1,741,352	1,348,216
Total Assets	10,407,528	3,269,874
Operating Segments \| Franchise Channel
Revenues:
Revenues	6,733,216	4,341,844
Operating Expenses:
Employee compensation and benefits	2,790,837	2,016,956
General and administrative expenses	745,142	694,143
Bad debts	74,020	140,493
Total operating expenses	3,609,999	2,851,592
Adjusted EBITDA	3,123,217	1,490,252
Other income (expense)		0
Class B unit compensation	0	0
Interest expense	0	0
Depreciation and amortization	(100,753)	(23,420)
Net Income	3,022,464	1,466,832
Total Assets	5,992,548	3,299,877
Other
Revenues:
Revenues	0	0
Operating Expenses:
Employee compensation and benefits	0	0
General and administrative expenses	604	14,884
Bad debts	0	0
Total operating expenses	604	14,884
Adjusted EBITDA	(604)	(14,884)
Other income (expense)		0
Class B unit compensation	0	0
Interest expense	(995,402)	(532,715)
Depreciation and amortization	0	0
Net Income	(996,006)	(547,599)
Total Assets	5,803,368	3,433,388
Commissions and agency fees
Revenues:
Revenues	9,595,576	6,361,846
Commissions and agency fees \| Operating Segments \| Corporate Channel
Revenues:
Revenues	7,855,665	5,549,105
Commissions and agency fees \| Operating Segments \| Franchise Channel
Revenues:
Revenues	1,739,911	812,741
Commissions and agency fees \| Other
Revenues:
Revenues	0	0
Franchise revenues
Revenues:
Revenues	4,910,528	3,481,116
Franchise revenues \| Operating Segments \| Corporate Channel
Revenues:
Revenues	0	0
Franchise revenues \| Operating Segments \| Franchise Channel
Revenues:
Revenues	4,910,528	3,481,116
Franchise revenues \| Other
Revenues:
Revenues	0	0
Interest income
Revenues:
Revenues	82,777	47,987
Interest income \| Operating Segments \| Corporate Channel
Revenues:
Revenues	0	0
Interest income \| Operating Segments \| Franchise Channel
Revenues:
Revenues	82,777	47,987
Interest income \| Other
Revenues:
Revenues	$ 0	$ 0

Pro Forma Earnings Per Share - Pro Forma Ownership Interest (Details)	May 01, 2018	Mar. 31, 2018 shares	Dec. 31, 2017 shares	Mar. 31, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Pro forma number of LLC Units outstanding (in shares)		36,279,934	36,279,934
Subsequent Event \| LLC Units
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Conversion ratio	1
Pro Forma
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Ownership interest held by Goosehead Insurance, Inc.		37.30%	37.30%
Ownership interest held by non-controlling interest holders		62.70%	62.70%	62.70%
Ownership interest		100.00%	100.00%
Parent
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Pro forma number of LLC Units outstanding (in shares)		13,533,267	13,533,267
Noncontrolling Interest
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Pro forma number of LLC Units outstanding (in shares)		22,746,667	22,746,667

Pro Forma Earnings Per Share - Pro Forma Basic EPS (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pro forma earnings per share:
Net income	$ 3,767,810	$ 2,267,449
Pro forma weighted average shares of Class A common stock outstanding (in shares)	13,533,267	13,533,267
Pro forma earnings per share (in dollars per share)	$ 0.08	$ 0.05
Pro Forma
Pro forma earnings per share:
Less: pro forma net income attributable to non-controlling interests	$ 2,362,328	$ 1,421,637
Pro forma income before taxes attributable to Goosehead Insurance, Inc.	1,405,482	845,812
Less: pro forma income tax expense	336,332	202,403
Pro forma net income attributable to Goosehead Insurance Inc.	$ 1,069,150	$ 643,409

Subsequent Events - Narrative (Details)		3 Months Ended
Subsequent Events - Narrative (Details)	May 01, 2018 USD ($) $ / shares shares	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	May 02, 2018 shares
Subsequent Event [Line Items]
Class B unit compensation \| $		$ 0	$ 0
Subsequent Event
Subsequent Event [Line Items]
Percentage of cash savings of tax receivable due to Pre-IPO LLC Members	85.00%
Class A Common Stock \| Subsequent Event
Subsequent Event [Line Items]
Shares outstanding (in shares)				13,533,267
Class B Common Stock \| Subsequent Event
Subsequent Event [Line Items]
Class B unit compensation \| $	$ 6,231,910
LLC Units and Common Class B \| Subsequent Event
Subsequent Event [Line Items]
Shares issued (in shares)	1,978,058
Class B unit compensation \| $	$ 19,780,578
Conversion ratio	1
Initial Public Offering \| Class A Common Stock \| Subsequent Event
Subsequent Event [Line Items]
Shares issued (in shares)	9,809,500
Share price (in dollars per share) \| $ / shares	$ 10
Over-Allotment Option \| Class A Common Stock \| Subsequent Event
Subsequent Event [Line Items]
Shares issued (in shares)	1,279,500
GM and TWIHG \| Class A Common Stock \| Subsequent Event
Subsequent Event [Line Items]
Shares outstanding (in shares)				3,723,767