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Commitments and Contingencies - Additional Information (Detail) (USD $) | 12 Months Ended
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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 |  |

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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