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Reinsurance - Reinsurance Arrangements (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reinsurance Disclosures [Abstract]                      
Direct premiums written                 $ 883,409 $ 789,577 $ 783,894
Ceded premiums written                 (256,961) (399,730) (522,116)
Net premiums written                 626,448 389,847 261,778
Direct Premiums Earned                 836,792 777,317 788,477
Ceded Premiums Earned                 (332,793) (450,440) (520,822)
Premiums earned, net $ 150,598 $ 146,153 $ 112,888 $ 94,360 $ 95,420 $ 94,288 $ 73,362 $ 63,807 503,999 326,877 267,655
Direct Losses and Loss Adjustment Expenses                 214,491 199,181 216,852
Ceded Losses and Loss Adjustment Expenses                 (26,752) (75,906) (108,237)
Net Losses and Loss Adjustment Expenses                 $ 187,739 $ 123,275 $ 108,615