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Reinsurance - Reinsurance Arrangements (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reinsurance Disclosures [Abstract]        
Direct premiums written $ 249,971 $ 220,009 $ 461,576 $ 411,926
Ceded premiums written (7,933) (76,483) (114,430) (198,132)
Net premiums written 242,038 143,526 347,146 213,794
Direct Premiums Earned 204,771 192,061 401,442 382,705
Ceded Premiums Earned (91,883) (118,699) (194,194) (245,536)
Premiums earned, net 112,888 73,362 207,248 137,169
Direct Losses and Loss Adjustment Expenses 49,701 46,970 98,991 97,692
Ceded Losses and Loss Adjustment Expenses (9,997) (19,291) (25,697) (43,188)
Net Losses and Loss Adjustment Expenses $ 39,704 $ 27,679 $ 73,294 $ 54,504