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Statutory Accounting Practices Disclosure - Assessments (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Expected Recoveries of Assessments [Roll Forward]        
Expected Recoveries of Assessments 1 $ 0uihc_ExpectedRecoveriesofAssessments1 $ 7uihc_ExpectedRecoveriesofAssessments1 $ 1,646uihc_ExpectedRecoveriesofAssessments1 $ 10uihc_ExpectedRecoveriesofAssessments1
Assessments Expensed 72uihc_AssessmentsExpensed 31uihc_AssessmentsExpensed 1,646uihc_AssessmentsExpensed  
Assessments Recovered (2)uihc_AssessmentsRecovered (1,528)uihc_AssessmentsRecovered 0uihc_AssessmentsRecovered  
Assessments Not Recoverable 1 $ 77uihc_AssessmentsNotRecoverable1 $ 142uihc_AssessmentsNotRecoverable1 $ 10uihc_AssessmentsNotRecoverable1