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Reinsurance - Reinsurance Arrangements (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reinsurance Disclosures [Abstract]                      
Direct premiums written                 $ 1,055,886 $ 954,617 $ 883,409
Ceded premiums written                 (318,826) (298,523) (256,961)
Net premiums written                 737,060 656,094 626,448
Direct premiums earned                 999,198 921,227 836,792
Ceded premiums earned                 (310,405) (288,811) (332,793)
Premiums earned, net $ 183,708 $ 174,517 $ 169,009 $ 161,559 $ 163,973 $ 159,534 $ 156,461 $ 152,448 688,793 632,416 503,999
Direct Losses and Loss Adjustment Expenses                 779,122 303,036 214,491
Ceded Losses and Loss Adjustment Expenses                 (428,694) (1,807) (26,752)
Net Losses and Loss Adjustment Expenses                 $ 350,428 $ 301,229 $ 187,739