Earnings per Share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator
Net income attributable to UIHC common stockholders	$ (74,072)	$ (28,280)	$ (62,521)	$ (21,714)
Denominator
Weighted-average shares outstanding	42,893,205	42,795,414	42,853,364	42,750,710
Effect of dilutive securities	0	0	0	0
Weighted-average diluted shares	42,893,205	42,795,414	42,853,364	42,750,710
Basic earnings per share	$ (1.73)	$ (0.66)	$ (1.46)	$ (0.51)
Diluted earnings per share	$ (1.73)	$ (0.66)	$ (1.46)	$ (0.51)