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Investments - Schedule of Depreciation Expense Related to Investment Real Estate (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Real Estate Investment        
Real Estate [Line Items]        
Depreciation expense on investment real estate $ 47 $ 103 $ 139 $ 311