Nature of Operations and Basis of Presentation - Additional Information (Detail)	Dec. 31, 2015 State
Accounting Policies [Abstract]
Number of states	11

Number of states where the insurance entity offers and writes insurance products.

No definition available.

Name:	uve_NumberOfStatesForOfferingPrimaryProduct
Namespace Prefix:	uve_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant