Reinsurance Recoverables (Detail) (USD $)	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Ceded Credit Risk [Line Items]
Reinsurance recoverables on paid losses	$ 61,600,000		$ 42,700,000
Ceded outstanding loss and LAE	1,302,100,000	[1]	1,305,900,000	[1]	831,800,000	[1]	847,400,000	[1]
Total reinsurance recoverables	$ 1,363,707,000		$ 1,348,599,000

[1] Reinsurance recoverables in this table include only ceded loss and LAE reserves.