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Reinsurance - Impact of Catastrophe Excess of Loss Reinsurance Treaties on Premiums Written and Earned (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
Premiums Written:        
Direct $ 132,923 $ 83,669 $ 203,772 $ 121,842
Assumed (476) (342) (2,076) (1,620)
Gross written 132,447 83,327 201,696 120,222
Ceded (24,617) (16,702) (46,613) (30,969)
Net premiums written 107,830 66,625 155,083 89,253
Premiums Earned:        
Direct 64,826 39,873 117,953 73,171
Assumed 17,126 13,899 46,546 35,299
Gross earned 81,952 53,772 164,499 108,470
Ceded (24,617) (16,702) (46,613) (30,969)
Net premiums earned $ 57,335 $ 37,070 $ 117,886 $ 77,501