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Losses and Loss Adjustment Expenses - Liability for Losses and Loss Adjustment Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Liability For Unpaid Claims And Claims Adjustment Expense Net [Abstract]        
Balance, beginning of period $ 41,751 $ 33,476 $ 41,168 $ 27,424
Incurred related to:        
Current period 18,431 15,995 35,362 34,401
Prior period (1,017) 202 (2,076) 964
Total incurred 17,414 16,197 33,286 35,365
Paid related to:        
Current period (9,520) (8,691) (13,252) (13,082)
Prior period (4,896) (3,669) (16,453) (12,394)
Total paid (14,416) (12,360) (29,705) (25,476)
Balance, end of period $ 44,749 $ 37,313 $ 44,749 $ 37,313