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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Real Estate Investment [Member]        
Real Estate [Line Items]        
Depreciation expense on investment real estate $ 103 $ 45 $ 307 $ 134