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Summarized Activity in Liability for Unpaid Losses and Loss Adjustment Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Liability for Claims and Claims Adjustment Expense [Line Items]        
Balance at beginning of period $ 754,595 $ 844,918 $ 779,466 $ 879,114
Ceded reinsurance receivables 178,998 229,815 192,491 240,546
Net balance at beginning of period 575,597 615,103 586,975 638,568
Incurred losses and loss adjustment expenses related to:        
Current year 36,501 37,115 119,464 107,202
Prior years 153 (1,632) (5,969) (5,007)
Total incurred losses and loss adjustment expenses 36,654 35,483 113,495 102,195
Paid losses and loss adjustment expenses related to:        
Current year 15,480 15,090 39,472 34,354
Prior years 28,704 32,088 92,931 103,001
Total paid losses and loss adjustment expenses 44,184 47,178 132,403 137,355
Net balance at end of period 568,067 603,408 568,067 603,408
Ceded reinsurance receivables 171,864 219,655 171,864 219,655
Balance at end of period $ 739,931 $ 823,063 $ 739,931 $ 823,063