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Reinsurance - Reinsurance Arrangements (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Insurance [Abstract]        
Direct premiums written $ 219,946 $ 222,568 $ 424,085 $ 412,571
Ceded premiums written (133,897) (102,433) (275,214) (265,867)
Net premiums written 86,049 120,135 148,871 146,704
Direct Premiums Earned 197,302 186,656 391,470 365,460
Ceded Premiums Earned (130,435) (130,962) (259,194) (261,126)
Premiums earned, net 66,867 55,694 132,276 104,334
Direct Loss and Loss Adjustment Expenses 50,350 56,533 100,946 109,140
Ceded Loss and Loss Adjustment Expenses (25,151) (27,096) (49,264) (53,529)
Net Loss and Loss Adjustment Expenses $ 25,199 $ 29,437 $ 51,682 $ 55,611