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Insurance Operations - Change in Liability for Unpaid Losses and LAE (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Insurance [Abstract]        
Balance at beginning of period $ 182,528 $ 172,300 $ 193,241 $ 187,215
Less reinsurance recoverable (75,680) (79,285) (81,415) (88,002)
Net balance at beginning of period 106,848 93,015 111,826 99,213
Incurred (recovered) related to current year 26,675 29,362 53,329 55,711
Incurred (recovered) related to prior year (1,476) 75 (1,647) (100)
Total incurred 25,199 29,437 51,682 55,611
Paid related to Current year 16,303 14,382 17,475 15,335
Paid related to Prior years 17,304 16,614 47,593 48,033
Total paid 33,607 30,996 65,068 63,368
Net balance at end of period 98,440 91,456 98,440 91,456
Plus reinsurance recoverable 67,820 73,169 67,820 73,169
Balance at end of period $ 166,260 $ 164,625 $ 166,260 $ 164,625