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Reinsurance - Additional Information (Detail) (USD $)
6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Reinsurers
Dec. 31, 2012
Reinsurers
Jun. 30, 2013
Credit Concentration Risk [Member]
Jun. 30, 2012
Credit Concentration Risk [Member]
Jun. 30, 2013
Credit Concentration Risk [Member]
Jun. 30, 2012
Credit Concentration Risk [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]            
Recoveries pertaining to reinsurance contracts     $ 0 $ 0 $ 0 $ 0
Number of reinsurers 27 31        
Reinsurance recoverables 0 0        
Credit risk associated with reinsurance receivables 0 0        
Recognized benefit on provisions $ 1,301,000