Net Income per Share - Summary of Reconciliation of Numerators and Denominators of Basic and Diluted Net Income (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Basic securities
Basic net income attributable to Health Insurance Innovations, Inc.	$ 17,885	$ 4,513
Weighted average shares—basic (in shares)	10,970,995	7,599,533
Earnings Per Share, Diluted [Abstract]
Weighted average shares—diluted (in shares)	11,937,725	7,909,235
Basic net income per share attributable to Health Insurance Innovations, Inc. (in USD per share)	$ 1.63	$ 0.59
Diluted net income per share attributable to Health Insurance Innovations, Inc. (in USD per share)	$ 1.50	$ 0.57
Restricted shares
Earnings Per Share, Diluted [Abstract]
Dilutive securities (in shares)	340,141	89,126
SARs
Earnings Per Share, Diluted [Abstract]
Dilutive securities (in shares)	606,029	176,801
Stock options
Earnings Per Share, Diluted [Abstract]
Dilutive securities (in shares)	20,560	43,775