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Stockholders' Equity - Pro Forma Ownership Interest (Details)
Jun. 30, 2018
shares
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
Ownership interest held by Goosehead Insurance, Inc. 37.30%
Ownership interest held by non-controlling interest holders 62.70%
Ownership interest 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
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