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Losses and Loss Adjustment Expenses - Liability for Unpaid Losses and Loss Adjustment Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Balance, beginning of period $ 54,727 $ 54,329 $ 51,690 $ 48,908
Incurred related to:        
Current period 21,283 24,419 68,703 63,473
Prior period 4,626 1,781 10,558 2,331
Total incurred 25,909 26,200 79,261 65,804
Paid related to:        
Current period (16,078) (16,059) (38,674) (31,111)
Prior period (7,363) (7,253) (35,082) (26,384)
Total paid (23,441) (23,312) (73,756) (57,495)
Balance, end of period $ 57,195 $ 57,217 $ 57,195 $ 57,217