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Reinsurance - Impact of Catastrophe Excess of Loss Reinsurance Treaties and One Quota Share Arrangement on Premiums Written and Earned (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Premiums Written:        
Direct $ 156,151 $ 141,280 $ 238,140 $ 220,942
Assumed (841) (360) (1,376) (1,083)
Gross written 155,310 140,920 236,764 219,859
Ceded (31,378) (28,572) (59,217) (56,080)
Net premiums written 123,932 112,348 177,547 163,779
Premiums Earned:        
Direct 87,196 81,761 170,802 160,281
Assumed 20,569 9,460 46,530 24,828
Gross earned 107,765 91,221 217,332 185,109
Ceded (31,378) (28,572) (59,217) (56,080)
Net premiums earned $ 76,387 $ 62,649 $ 158,115 $ 129,029