Earnings per Share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator
Net income attributable to UIHC common stockholders	$ (2,903)	$ 14,701	$ 6,566	$ 23,069
Denominator
Weighted-average shares outstanding	42,762,417	42,648,660	42,729,730	42,615,484
Effect of dilutive securities	0	141,686	367,514	154,118
Weighted-average diluted shares	42,762,417	42,790,346	43,097,244	42,769,602
Basic earnings per share	$ (0.07)	$ 0.34	$ 0.15	$ 0.54
Diluted earnings per share	$ (0.07)	$ 0.34	$ 0.15	$ 0.54