XML 11 R1.htm IDEA: XBRL DOCUMENT v3.10.0.1
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2018
Nov. 06, 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 Sep. 30, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period 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