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Investments - Schedule of Real Estate Investment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Real Estate [Line Items]    
Investment real estate, net $ 18,474 $ 11,435
Income Producing [Member]    
Real Estate [Line Items]    
Investment real estate 6,918 6,918
Less: Accumulated depreciation (460) (281)
Investment real estate, net 6,458 6,637
Non-Income Producing [Member]    
Real Estate [Line Items]    
Properties under development $ 12,016 $ 4,798