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Related Party Transactions - Payments Made by Company to Downes and Associates (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
SPC Global RE Advisors LLC [Member]        
Related Party Transaction [Line Items]        
Payments made by the company $ 30 $ 30 $ 90 $ 90