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Estimated Earned Premium and Incurred Losses (Detail) (Hiscox Bermuda, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Hiscox Bermuda
       
Related Party Transaction [Line Items]        
Assumed earned premium $ 1,823 $ 955 $ 4,639 $ 1,953
Assumed losses and loss adjustment expenses $ 504 $ 287 $ 1,349 $ 665