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Insurance Products and Reinsurance of Certain Risks - Net Premiums Written and Earned Premiums (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Insurance [Abstract]      
Net Written Premiums $ 40,491 $ 31,576 $ 30,812
Earned Premiums $ 25,881 $ 22,498 $ 20,257