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Summarized Activity in Liability for Unpaid Losses and Loss Adjustment Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]    
Balance at beginning of period $ 634,664 $ 651,042
Less: Ceded reinsurance receivables 97,243 130,439
Net balance at beginning of period 537,421 520,603
Purchased reserves gross   2,496
Purchased reserves ceded   549
Purchased reserves, net of third party reinsurance   3,045
Incurred losses and loss adjustment expenses related to:    
Current year 61,999 72,691
Prior years (5,927) (10,130)
Total incurred losses and loss adjustment expenses 56,072 62,561
Paid losses and loss adjustment expenses related to:    
Current year 17,454 24,384
Prior years 53,228 42,383
Total paid losses and loss adjustment expenses 70,682 66,767
Net balance at end of period 522,811 519,442
Plus: Ceded reinsurance receivables 92,314 102,646
Balance at end of period $ 615,125 $ 622,088