Earnings per Share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator
Net income attributable to UIHC common stockholders	$ (28,280)	$ (11,708)	$ (21,714)	$ 11,361
Denominator
Weighted-average shares outstanding	42,795,414	42,677,893	42,750,710	42,636,515
Effect of dilutive securities	0	0	0	154,693
Weighted-average diluted shares	42,795,414	42,677,893	42,750,710	42,791,208
Basic earnings per share	$ (0.66)	$ (0.27)	$ (0.51)	$ 0.27
Diluted earnings per share	$ (0.66)	$ (0.27)	$ (0.51)	$ 0.27