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Related Party Transactions - Payments Made by Company to Downes and Associates (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Downes and Associates [Member]      
Related Party Transaction [Line Items]      
Payments made by the company to related party     $ 477
SPC Global RE Advisors LLC [Member]      
Related Party Transaction [Line Items]      
Payments made by the company to related party $ 90 $ 120 $ 68