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Investments - Investment Income (Loss) Summarized (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Schedule Of Investments [Line Items]      
Recognized investment income (loss) $ 3,963 $ 4,947 $ (1,595)
Real estate investments 16,126 4,086 (620)
Net investment income 32,447 12,335 4,564
Gain (Loss) Related to Litigation Settlement   2,790  
Available-for-Sale-Fixed-Maturity Securities [Member]      
Schedule Of Investments [Line Items]      
Investment income 6,367 1,375 4,252
Equity Securities [Member]      
Schedule Of Investments [Line Items]      
Investment income 1,204 1,411 1,388
Limited Partnership Investment [Member]      
Schedule Of Investments [Line Items]      
Recognized investment income (loss) 3,963 4,947 (1,595)
Cash and Cash Equivalents [Member]      
Schedule Of Investments [Line Items]      
Investment income 4,783 641 1,691
Short-term Investments [Member]      
Schedule Of Investments [Line Items]      
Investment income 0 0 2
Investment Expense [Member]      
Schedule Of Investments [Line Items]      
Investment expense (491) (542) (497)
Income (Loss) from Unconsolidated Joint Venture [Member]      
Schedule Of Investments [Line Items]      
Investment income $ 495 $ 417 $ (57)