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Schedule VI - Supplemental Information Concerning Consolidated Property and Casualty Insurance Operations (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
Dec. 31, 2010
Supplemental Information For Property Casualty Insurance Underwriters [Abstract]                        
Reserves for Unpaid Losses and LAE $ 159,222       $ 193,241       $ 159,222 $ 193,241 $ 187,215  
Incurred Loss and LAE current year                 111,560 119,458 112,838  
Incurred loss and LAE prior years                 (2,945) 6,729 11,471  
Paid Losses and LAE                 129,803 113,574 104,910  
Net investment income 1,397 382 137 12 278 215 (16) (36) 1,928 441 788  
Deferred Policy Acquisition Cost (DAC) 15,899       17,282       15,899 17,282 12,996 9,445
Amortization of DAC                 (21,685) (16,190) (21,477)  
Net premiums written                 261,778 262,524 208,483  
Net premiums earned 66,452 68,927 66,867 65,409 67,274 59,512 55,694 48,640 267,655 231,120 198,985  
Unearned Premiums $ 383,488       $ 388,071       $ 383,488 $ 388,071 $ 359,842