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Losses and Loss Adjustment Expenses - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Liability For Unpaid Claims And Claims Adjustment Expense Net [Abstract]    
Unpaid claims and claims adjustment expense overall favorable development $ 1,017 $ 2,076