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Stockholders' Equity Stockholders' Equity - Narrative (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended
Feb. 03, 2015
Mar. 05, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Class of Stock [Line Items]          
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 503,857us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued        
Stock Issued During Period, Shares, New Issues   4,600,000us-gaap_StockIssuedDuringPeriodSharesNewIssues      
Proceeds from Issuance of Common Stock     $ 0us-gaap_ProceedsFromIssuanceOfCommonStock $ 54,046us-gaap_ProceedsFromIssuanceOfCommonStock  
Preferred Stock, Shares Authorized     1,000,000us-gaap_PreferredStockSharesAuthorized   1,000,000us-gaap_PreferredStockSharesAuthorized
Blank Check Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred Stock, Shares Authorized     875,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= uihc_BlankCheckPreferredStockMember