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Reinsurance - Reinsurance Arrangements (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Reinsurance Disclosures [Abstract]        
Direct premiums written $ 271,921 $ 249,971 $ 499,894 $ 461,576
Ceded premiums written (72,874) (7,933) (146,933) (114,430)
Net premiums written 199,047 242,038 352,961 347,146
Direct Premiums Earned 226,819 204,771 448,070 401,442
Ceded Premiums Earned (70,358) (91,883) (139,161) (194,194)
Premiums earned, net 156,461 112,888 308,909 207,248
Direct Losses and Loss Adjustment Expenses 58,434 49,701 124,581 98,991
Ceded Losses and Loss Adjustment Expenses 1,649 (9,997) 1,619 (25,697)
Net Losses and Loss Adjustment Expenses $ 60,083 $ 39,704 $ 126,200 $ 73,294