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Investments - Investment (Loss) Income Summarized (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]        
Investment income $ 1,043 $ 247 $ 832 $ 852
Net investment income (loss) from real estate investments (105) 14 201 217
Loss (income) from unconsolidated joint venture (21) 381 (54) 330
Net investment income 4,226 3,399 7,504 6,617
Equity Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income 293 534 674 1,155
Limited Partnership Investment [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income 1,043 247 832 852
Cash and Cash Equivalents [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income 1,495 818 2,571 1,642
Short-term Investments [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income 5 426 358 473
Investment Expense [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment expense (106) (140) (235) (310)
Available-for-Sale Securities [Member] | Fixed-Maturity Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investment income $ 1,622 $ 1,119 $ 3,157 $ 2,258