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Reinsurance - Reinsurance Arrangements (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Insurance [Abstract]                      
Direct premiums written                 $ 783,894 $ 780,128 $ 721,462
Ceded premiums written                 (522,116) (517,604) (512,979)
Net premiums written                 261,778 262,524 208,483
Direct Premiums Earned                 788,477 751,899 689,955
Ceded Premiums Earned                 (520,822) (520,779) (490,970)
Premiums earned, net 66,452 68,927 66,867 65,409 67,274 59,512 55,694 48,640 267,655 231,120 198,985
Direct Losses and Loss Adjustment Expenses                 216,852 249,064 245,335
Ceded Losses and Loss Adjustment Expenses                 (108,237) (122,877) (121,026)
Net Losses and Loss Adjustment Expenses                 $ 108,615 $ 126,187 $ 124,309