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Investments - Investment Income Summarized (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]        
Investment income     $ (462)  
Investment income, Total $ 1,795 $ 1,481 3,204 $ 2,540
Limited Partnership Investment [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income (197)   (462)  
Real Estate Investments [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment expense 62 (119) (21) (403)
Cash and Cash Equivalents [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income 162 185 297 359
Other [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income 15   29  
Available-for-Sale Securities [Member] | Fixed-Maturity Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income 1,051 1,055 1,877 2,052
Available-for-Sale Securities [Member] | Equity Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income 869 484 1,796 741
Available-for-Sale Securities [Member] | Investment Expense [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment expense $ (167) $ (124) $ (312) $ (209)