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Summarized Activity in 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 Claims and Claims Adjustment Expense [Line Items]        
Balance at beginning of period $ 770,119 $ 779,047 $ 675,472 $ 779,466
Less:Ceded reinsurance receivables 140,508 195,533 123,201 192,491
Net balance at beginning of period 629,611 583,514 552,271 586,975
Purchased reserves, gross (584)   88,370  
Less: Purchased reserves ceded     11,681  
Purchased reserves, net (584)   76,689  
Incurred losses and loss adjustment expenses related to:        
Current year 84,724 42,298 157,838 82,964
Prior years (5,164) (4,028) (8,659) (6,122)
Total incurred losses and loss adjustment expenses 79,560 38,270 149,179 76,842
Paid losses and loss adjustment expenses related to:        
Current year 45,379 15,785 60,061 23,997
Prior years 32,406 30,402 87,276 64,223
Total paid losses and loss adjustment expenses 77,785 46,187 147,337 88,220
Net balance at end of period 630,802 575,597 630,802 575,597
Plus:Ceded reinsurance receivables 138,497 178,998 138,497 178,998
Balance at end of period $ 769,299 $ 754,595 $ 769,299 $ 754,595