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Commitments and Contingencies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Agreement
Location
Branches
Dec. 31, 2012
Dec. 31, 2011
Commitments And Contingencies [Line Items]      
Non-cancelable operating leases expiration dates through 2017    
Operating lease commitments included in restructuring charges $ 3,812,637    
Number of branch closed 1    
Total rental expenses 2,142,995 2,531,929 2,838,066
Income from subleases 70,835 54,846 33,326
Number of locations 2    
Number of change in control agreements 2    
Employee compensation multiples 2.5    
Change in control period considered after termination 6 months    
Restructuring Charges [Member]
      
Commitments And Contingencies [Line Items]      
Operating lease commitments included in restructuring charges $ 39,646