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Investments - Schedule of Real Estate Investment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Real Estate [Line Items]    
Investment real estate, net $ 23,720 $ 18,474
Income Producing [Member]    
Real Estate [Line Items]    
Investment real estate 14,619 6,918
Less: Accumulated depreciation (767) (460)
Investment real estate, net 13,852 6,458
Non-Income Producing [Member]    
Real Estate [Line Items]    
Properties under development $ 9,868 $ 12,016