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Investments - Schedule of Depreciation Expense Related to Investment Real Estate (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]        
Depreciation expense on investment real estate $ 47 $ 47 $ 93 $ 93