Investments - Summary of Unrealized Gains (Losses) In Private Equity Investment Private Limited Partnership (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Unrealized gains (losses) recognized during the reported period on investment in private equity limited partnership still held at the end of the reported period	$ 0	$ 5,640

Unrealized Gain (Loss) on Investment Owned at Fair Value

No definition available.

Name:	uve_UnrealizedGainLossOnInvestmentOwnedAtFairValue
Namespace Prefix:	uve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration