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Securitization of Receivables - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | |||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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| Accounts Receivable Securitization [Line Items] | |||||
| Gain on securitization of receivables | $ 884,500 | $ 535,814 | $ 884,500 | $ 1,630,871 | |
| Account receivables managed | 1,757,392,453 | 1,757,392,453 | 1,623,034,217 | ||
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Asset-backed Securities, Securitized Loans and Receivables [Member]
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| Accounts Receivable Securitization [Line Items] | |||||
| Account receivables managed | $ 1,423,052,308 | $ 1,423,052,308 | $ 1,431,635,500 | ||
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Minimum [Member]
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| Accounts Receivable Securitization [Line Items] | |||||
| Annual servicing fees | 0.05% | ||||
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Maximum [Member]
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| Accounts Receivable Securitization [Line Items] | |||||
| Annual servicing fees | 0.20% | ||||