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Investments - Investment (Loss) Income Summarized (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]        
Investment income     $ 54 $ (2,862)
(Loss) income from unconsolidated joint venture $ (75) $ 5 153 4
Net investment income (loss) 2,740 (519) 5,955 2,685
Other [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income 12 15 35 44
Limited Partnership Investment [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income 1,119 (2,400) 54 (2,862)
Real Estate Investments [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Net investment income (loss) from real estate investments (417) (135) (500) (155)
Cash and Cash Equivalents [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income 285 161 755 461
Available-for-Sale Securities [Member] | Fixed-Maturity Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income 1,170 1,120 3,400 2,994
Available-for-Sale Securities [Member] | Equity Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income 811 914 2,546 2,710
Available-for-Sale Securities [Member] | Investment Expense [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment expense $ (165) $ (199) $ (488) $ (511)