v2.4.0.6
Results of Operations Related to Reinsurance Agreements (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Related Party Transaction [Line Items]        
Change in unearned premium - ceded $ (57,595) $ (127,399) $ (103,348) $ (161,080)
Incurred loss and loss adjustment expense - ceded 211,787 170,008 411,716 298,704
Related Party Transactions
       
Related Party Transaction [Line Items]        
Premium written - ceded (196,380) (213,919) (387,281) (340,641)
Change in unearned premium - ceded 26,378 77,227 50,961 90,013
Earned premium - ceded (170,002) (136,692) (336,320) (250,628)
Ceding commission on premium written 50,858 44,160 105,269 83,885
Ceding commission - deferred (6,308) (9,796) (14,445) (13,712)
Ceding commission - earned 44,550 34,364 90,824 70,173
Incurred loss and loss adjustment expense - ceded $ 125,970 $ 98,957 $ 248,780 $ 181,064