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Non-controlling interest - Effect of changes in ownership interests on equity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Noncontrolling Interest [Line Items]                
Net income attributable to Goosehead Insurance Inc. $ 4,036     $ 3,267     $ 5,127 $ 6,490
Decrease in additional paid-in capital as a result of the redemption of LLC interests 0 $ 0 $ 0 0 $ 0 $ 0    
Increase in additional paid-in capital as a result of activity under employee stock purchase plan 194 214 205 142 138 116    
Parent                
Noncontrolling Interest [Line Items]                
Net income attributable to Goosehead Insurance Inc. 4,036     3,267     5,127 6,490
Decrease in additional paid-in capital as a result of the redemption of LLC interests (1,144) (1,280) (249) (577) (762) (869) (2,673) (2,208)
Increase in additional paid-in capital as a result of activity under employee stock purchase plan 194 $ 214 $ 205 142 $ 138 $ 116 613 396
Total effect of changes in ownership interest on equity attributable to Goosehead Insurance Inc. $ 3,086     $ 2,832     $ 3,067 $ 4,678