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Losses and Loss Adjustment Expenses - Liability for Unpaid Losses and Loss Adjustment Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Balance, beginning of period $ 51,177 $ 43,597 $ 48,908 $ 43,686
Incurred related to:        
Current period 20,222 18,648 39,054 37,562
Prior period 343 (265) 550 (614)
Total incurred 20,565 18,383 39,604 36,948
Paid related to:        
Current period (10,256) (12,228) (15,052) (18,835)
Prior period (7,157) (6,708) (19,131) (18,755)
Total paid (17,413) (18,936) (34,183) (37,590)
Balance, end of period $ 54,329 $ 43,044 $ 54,329 $ 43,044