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Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2012
Jun. 30, 2013
Dec. 31, 2011
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Schedule Of Significant Accounting Policies [Line Items]            
Unsecured amounts due from reinsurers exceeding a fixed percentage of stockholders equity   3.00%        
Deferred policy acquisition costs $ 11,798,000 $ 17,241,000   $ 17,377,000 $ 17,282,000 $ 17,744,000
Deferred policy acquisition costs, net, difference percentage     13.00%      
Deferred policy acquisition costs, pre-tax charge against earnings 1,600,000          
Maximum amortization period for capitalized cost   12 months        
Acquisition-Related Costs [Member] | Minimum [Member]
            
Schedule Of Significant Accounting Policies [Line Items]            
Deferred policy acquisition costs     11,400,000      
Acquisition-Related Costs [Member] | Maximum [Member]
            
Schedule Of Significant Accounting Policies [Line Items]            
Deferred policy acquisition costs     $ 13,000,000