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Summarized Activity in Liability for Unpaid Losses and Loss Adjustment Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Liability for Claims and Claims Adjustment Expense [Line Items]        
Balance at beginning of period $ 769,299 $ 754,595 $ 675,472 $ 779,466
Less:Ceded reinsurance receivables 138,497 178,998 123,201 192,491
Net balance at beginning of period 630,802 575,597 552,271 586,975
Purchased reserves, gross 1,119   89,489  
Less: Purchased reserves ceded (1,119)   (12,800)  
Purchased reserves, net     76,689  
Incurred losses and loss adjustment expenses related to:        
Current year 86,203 36,501 244,041 119,464
Prior years (8,512) 153 (17,171) (5,969)
Total incurred losses and loss adjustment expenses 77,691 36,654 226,870 113,495
Paid losses and loss adjustment expenses related to:        
Current year 53,512 15,480 113,573 39,472
Prior years 56,385 28,704 143,661 92,931
Total paid losses and loss adjustment expenses 109,897 44,184 257,234 132,403
Net balance at end of period 598,596 568,067 598,596 568,067
Plus:Ceded reinsurance receivables 130,913 171,864 130,913 171,864
Balance at end of period $ 729,509 $ 739,931 $ 729,509 $ 739,931