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Reinsurance - Reinsurance Arrangements (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reinsurance Disclosures [Abstract]                      
Direct premiums written                 $ 954,617 $ 883,409 $ 789,577
Ceded premiums written                 (298,523) (256,961) (399,730)
Net premiums written                 656,094 626,448 389,847
Direct Premiums Earned                 921,227 836,792 777,317
Ceded premium earned                 (288,811) (332,793) (450,440)
Premiums earned, net $ 163,973 $ 159,534 $ 156,461 $ 152,448 $ 150,598 $ 146,153 $ 112,888 $ 94,360 632,416 503,999 326,877
Direct Losses and Loss Adjustment Expenses                 303,036 214,491 199,181
Ceded Losses and Loss Adjustment Expenses                 (1,807) (26,752) (75,906)
Net Losses and Loss Adjustment Expenses                 $ 301,229 $ 187,739 $ 123,275