Earnings per Share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator
Net income attributable to UIHC common stockholders	$ 24,274	$ (2,903)	$ 11,551	$ 6,566
Denominator
Weighted-average shares outstanding	42,860,922	42,762,417	42,833,225	42,729,730
Effect of dilutive securities	194,193	0	208,398	367,514
Weighted-average diluted shares	43,055,115	42,762,417	43,041,623	43,097,244
Basic earnings per share	$ 0.57	$ (0.07)	$ 0.27	$ 0.15
Diluted earnings per share	$ 0.56	$ (0.07)	$ 0.27	$ 0.15