Earnings per Share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator
Net income attributable to UIHC common stockholders	$ 9,469	$ 8,369
Denominator
Weighted-average shares outstanding	42,696,681	42,581,939
Effect of dilutive securities	289,803	166,688
Weighted-average diluted shares	42,986,484	42,748,627
Basic earnings per share	$ 0.22	$ 0.20
Diluted earnings per share	$ 0.22	$ 0.20