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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Real Estate Investment [Member]        
Real Estate [Line Items]        
Depreciation expense on investment real estate $ 101 $ 44 $ 204 $ 89