v2.4.0.6
Results of Operations Related to Reinsurance Agreements (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Related Party Transaction [Line Items]        
Change in unearned premium - ceded $ (96,212) $ (33,055) $ (199,560) $ (194,135)
Incurred loss and loss adjustment expense - ceded 255,646 185,352 667,362 484,056
Related Party Transactions
       
Related Party Transaction [Line Items]        
Premium written - ceded (189,655) (173,218) (576,936) (513,859)
Change in unearned premium - ceded 10,541 13,008 61,502 103,022
Earned premium - ceded (179,114) (160,210) (515,434) (410,837)
Ceding commission on premium written 51,955 48,339 157,224 132,224
Ceding commission - deferred (2,095) (6,557) (16,540) (20,269)
Ceding commission - earned 49,860 41,782 140,684 111,955
Incurred loss and loss adjustment expense - ceded $ 158,646 $ 94,371 $ 407,426 $ 275,434