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Reserve for Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract]                        
Minimum period for claims resolution                 5 years      
Summary of reserve for losses and loss adjustment expenses                        
Balance, beginning of year       $ 2,058,266       $ 2,072,822 $ 2,058,266 $ 2,072,822 $ 2,054,994  
Receivable from reinsurers on unpaid losses and loss adjustment expenses $ 249,350       $ 237,966       249,350 237,966 247,518 $ 191,645
Net balance, beginning of year       1,820,300       1,825,304 1,820,300 1,825,304 1,863,349  
Net reserves acquired from acquisitions                 0 139,549 126,007  
Net losses:                        
Current year 149,157 $ 145,027 $ 139,057 138,654 124,271 $ 142,124 $ 141,126 137,647 571,891 545,168 447,510  
Favorable development of reserves established in prior years, net (56,330) $ (36,221) $ (35,115) $ (33,514) (48,830) $ (42,902) $ (42,213) $ (48,139) (161,180) (182,084) (222,749)  
Total                 410,711 363,084 224,761  
Paid related to:                        
Current year                 (84,186) (93,737) (43,616)  
Prior years                 (390,849) (413,900) (345,197)  
Total paid                 (475,035) (507,637) (388,813)  
Net balance, end of year 1,755,976       1,820,300       1,755,976 1,820,300 1,825,304  
Balance, end of year $ 2,005,326       $ 2,058,266       $ 2,005,326 $ 2,058,266 $ 2,072,822  
Liability for unpaid claims and claims adjustment expense incurred claims prior years accident years                 2008 through 2012 2007 through 2011 2005 through 2011