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Other Invested Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Other invested assets $ 2,976 $ 21,183
Low Income Housing Tax Credit Properties    
Schedule of Investments [Line Items]    
Other invested assets   138
Derivative    
Schedule of Investments [Line Items]    
Other invested assets $ 2,976 $ 21,045