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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Class_Member
Dec. 31, 2012
Commitments And Contingencies [Line Items]    
License bonds outstanding amount $ 2.0 $ 2.7
Number of class member opted out of settlement before finalization 18  
Damages sought amount 87  
Letters of Credit [Member]
    
Commitments And Contingencies [Line Items]    
Letters of credit outstanding 2.5 2.5
Ashkenazi [Member]
    
Commitments And Contingencies [Line Items]    
Damages sought amount 92  
Victims Recovery [Member]
    
Commitments And Contingencies [Line Items]    
Damages sought amount 53  
Marsh [Member]
    
Commitments And Contingencies [Line Items]    
Damages sought amount 200  
Rader [Member]
    
Commitments And Contingencies [Line Items]    
Damages sought amount 15  
Guarantor [Member]
    
Commitments And Contingencies [Line Items]    
Letters of credit outstanding $ 1.9 $ 1.9